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176-501: In 2075, teenager Matt Dodson applies to join the prestigious Interplanetary Patrol. After a number of physical, mental, and ethics tests, he is accepted as a cadet. He makes friends with fellow recruits William "Tex" Jarman, Venus -born Oscar Jensen, and Pierre Armand from Ganymede . His first roommate is Girard Burke, the arrogant son of a wealthy spaceship builder. They are transported to the orbiting school ship PRS James Randolph for further training. Burke eventually either resigns or

352-590: A dust ring-cloud , with a suspected origin either from Venus–trailing asteroids, interplanetary dust migrating in waves, or the remains of the Solar System's original circumstellar disc that formed the planetary system . Earth and Venus have a near orbital resonance of 13:8 (Earth orbits eight times for every 13 orbits of Venus). Therefore, they approach each other and reach inferior conjunction in synodic periods of 584 days, on average. The path that Venus makes in relation to Earth viewed geocentrically draws

528-490: A habitable environment , before a runaway greenhouse effect evaporated any water and turned Venus into its present state. The rotation of Venus has been slowed and turned against its orbital direction ( retrograde ) by the currents and drag of its atmosphere. It takes 224.7 Earth days for Venus to complete an orbit around the Sun, and a Venusian solar year is just under two Venusian days long. The orbits of Venus and Earth are

704-408: A pentagram over five synodic periods, shifting every period by 144°. This pentagram of Venus is sometimes referred to as the petals of Venus due to the path's visual similarity to a flower. When Venus lies between Earth and the Sun in inferior conjunction, it makes the closest approach to Earth of any planet at an average distance of 41 million km (25 million mi). Because of

880-535: A 14-year-old African American from Chicago, visited his relatives in Money, Mississippi , for the summer. He allegedly had an interaction with a white woman, Carolyn Bryant, in a small grocery store that violated the norms of Mississippi culture, and Bryant's husband Roy and his half-brother J. W. Milam brutally murdered young Emmett Till. They beat and mutilated him before shooting him in the head and sinking his body in the  Tallahatchie River . Three days later, Till's body

1056-451: A 4" telescope. Although naked eye visibility of Venus's phases is disputed, records exist of observations of its crescent. When Venus is sufficiently bright with enough angular distance from the sun, it is easily observed in a clear daytime sky with the naked eye, though most people do not know to look for it. Astronomer Edmund Halley calculated its maximum naked eye brightness in 1716, when many Londoners were alarmed by its appearance in

1232-414: A Venusian year (243 versus 224.7 Earth days). Slowed by its strong atmospheric current the length of the day also fluctuates by up to 20 minutes. Venus's equator rotates at 6.52 km/h (4.05 mph), whereas Earth's rotates at 1,674.4 km/h (1,040.4 mph). Venus's rotation period measured with Magellan spacecraft data over a 500-day period is smaller than the rotation period measured during

1408-468: A backlash for his involvement with white actress Kim Novak . Davis briefly married a black dancer in 1958 to protect himself from mob violence. In 1958, officers in Virginia entered the home of Mildred and Richard Loving and dragged them out of bed for living together as an interracial couple, on the basis that "any white person intermarry with a colored person"— or vice versa—each party "shall be guilty of

1584-583: A bus boycott was considered and rejected. But when Rosa Parks was arrested in December, Jo Ann Gibson Robinson of the Montgomery Women's Political Council put the bus boycott protest in motion. Late that night, she, John Cannon (chairman of the Business Department at Alabama State University ) and others mimeographed and distributed thousands of leaflets calling for a boycott. The eventual success of

1760-459: A change that would have occurred over the course of billions of years. The rotation period of Venus may represent an equilibrium state between tidal locking to the Sun's gravitation, which tends to slow rotation, and an atmospheric tide created by solar heating of the thick Venusian atmosphere. The 584-day average interval between successive close approaches to Earth is almost exactly equal to 5   Venusian solar days (5.001444 to be precise), but

1936-468: A combined strategy of direct action , nonviolence , nonviolent resistance , and many events described as civil disobedience , giving rise to the civil rights movement of 1954 to 1968. A. Philip Randolph had planned a march on Washington, D.C., in 1941 to support demands for elimination of employment discrimination in the defense industry ; he called off the march when the Roosevelt administration met

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2112-561: A depression. These features are volcanic in origin. Most Venusian surface features are named after historical and mythological women. Exceptions are Maxwell Montes, named after James Clerk Maxwell , and highland regions Alpha Regio , Beta Regio , and Ovda Regio . The last three features were named before the current system was adopted by the International Astronomical Union , the body which oversees planetary nomenclature . The longitude of physical features on Venus

2288-463: A dynamo at its core. A dynamo requires three things: a conducting liquid, rotation, and convection . The core is thought to be electrically conductive and, although its rotation is often thought to be too slow, simulations show it is adequate to produce a dynamo. This implies that the dynamo is missing because of a lack of convection in Venus's core. On Earth, convection occurs in the liquid outer layer of

2464-484: A felony" and face prison terms of five years. Invigorated by the victory of Brown and frustrated by the lack of immediate practical effect, private citizens increasingly rejected gradualist, legalistic approaches as the primary tool to bring about desegregation . They were faced with " massive resistance " in the South by proponents of racial segregation and voter suppression . In defiance, African-American activists adopted

2640-615: A march from Selma to Montgomery . The movement was led by Martin Luther King Jr. , James Bevel , and others, and press coverage of police violence using fire hoses and dogs against students attempting to walk to City Hall to talk with the mayor during the Birmingham campaign increased its public support. Discrimination was often supported by courts, including by the Supreme Court in its 1896 decision Plessy v. Ferguson , which upheld

2816-449: A more massive primary atmosphere from solar nebula have been proposed to explain the enrichment. However, the atmosphere is depleted of radiogenic argon, a proxy for mantle degassing, suggesting an early shutdown of major magmatism. Studies have suggested that billions of years ago, Venus's atmosphere could have been much more like the one surrounding the early Earth, and that there may have been substantial quantities of liquid water on

2992-563: A neighborhood a character or property or occupancy, members of any race or nationality, or any individual whose presence will be clearly detrimental to property values in a neighborhood." The result was the development of all-black ghettos in the North and West, where much housing was older, as well as South. The first anti-miscegenation law was passed by the Maryland General Assembly in 1691, criminalizing interracial marriage . In

3168-562: A network of chapters as the NAACP did. It offered training and leadership assistance for local efforts to fight segregation. The headquarters organization raised funds, mostly from Northern sources, to support such campaigns. It made nonviolence both its central tenet and its primary method of confronting racism. In 1959, Septima Clarke , Bernice Robinson, and Esau Jenkins , with the help of Myles Horton 's Highlander Folk School in Tennessee , began

3344-465: A plethora of aspects of life. Within employment, economic opportunities for blacks were routed to the lowest status and restrictive in potential mobility. Within the housing market, stronger discriminatory measures were used in correlation to the influx, resulting in a mix of "targeted violence, restrictive covenants , redlining and racial steering ". The Great Migration resulted in many African Americans becoming urbanized, and they began to realign from

3520-464: A rich deposit of radioactive ores. The locals promptly attacked the ship and killed his crew; Burke managed to send a message for help before being taken prisoner. Jensen gains the matriarch's trust and convinces her that they are honorable and civilized, unlike Burke, and the Patrolmen are released. Unfortunately, neither the lander nor Burke's ship is flightworthy. To their amazement, the matriarch takes

3696-577: A speech in Charleston, Illinois in 1858, Abraham Lincoln stated, "I am not, nor ever have been in favor of making voters or jurors of negroes, nor of qualifying them to hold office, nor to intermarry with white people". By the late 1800s, 38 US states had anti-miscegenation statutes. By 1924, the ban on interracial marriage was still in force in 29 states. While interracial marriage had been legal in California since 1948, in 1957 actor Sammy Davis Jr. faced

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3872-505: A watershed historical moment without Mamie finding the strength to make her private grief a public matter." The visceral response to his mother's decision to have an open-casket funeral mobilized the black community throughout the U.S. The murder and resulting trial ended up markedly impacting the views of several young black activists. Joyce Ladner referred to such activists as the "Emmett Till generation." One hundred days after Emmett Till's murder, Rosa Parks refused to give up her seat on

4048-426: A wider allegiance to humanity as a whole and to the sentient species of the Solar System. They are told the stories of four Patrol heroes/martyrs who exemplify this quality. One of them, Rivera, leaves orders to annihilate his hometown if he is held captive there during negotiations. Heinlein later expanded another of these anecdotes into " The Long Watch ". The young, idealistic Matt feels that he should be able, if

4224-422: Is 96.5% carbon dioxide, with most of the remaining 3.5% being nitrogen . The surface pressure is 9.3 megapascals (93 bars ), and the average surface temperature is 737 K (464 °C; 867 °F), above the critical points of both major constituents and making the surface atmosphere a supercritical fluid out of mainly supercritical carbon dioxide and some supercritical nitrogen. The Venusian surface

4400-589: Is a rocky body like Earth. It is similar to Earth in size and mass and is often described as Earth's "sister" or "twin". Venus is close to spherical due to its slow rotation. Venus has a diameter of 12,103.6 km (7,520.8 mi)—only 638.4 km (396.7 mi) less than Earth's—and its mass is 81.5% of Earth's, making it the third-smallest planet in the Solar System . Conditions on the Venusian surface differ radically from those on Earth because its dense atmosphere

4576-539: Is also a subplot revolving around the issue of what it means to be a good soldier. Discouraged by the intellectual demands of his Patrol training, and attracted to the glamor and esprit de corps of the Marines , Matt requests a transfer, but is dissuaded by his mentor. The mentor, dividing human motivations into three types, explains that the Patrol, which has the responsibility of holding the ultimate weapon and keeping overall peace,

4752-506: Is asked to leave, and goes into the merchant service, but the remainder do well enough to be assigned to working Patrol ships. Dodson, Jarman and Jensen ship out on the Aes Triplex . Their first real mission is to help search for a missing research vessel, the Pathfinder , in the asteroid belt . They find it, but all aboard are dead, the unlucky victims of a fast-moving object that punctured

4928-430: Is caused by atmospheric interactions with the solar wind . Internal heat escapes through active volcanism , resulting in resurfacing instead of plate tectonics . Venus is one of two planets in the Solar System , the other being Mercury , that have no moons . Conditions perhaps favourable for life on Venus have been identified at its cloud layers. Venus may have had liquid surface water early in its history with

5104-405: Is currently volcanically active, specifically the detection of olivine , a volcanic product that would weather quickly on the planet's surface. This massive volcanic activity is fuelled by a superheated interior, which models say could be explained by energetic collisions from when the planet was young. Impacts would have had significantly higher velocity than on Earth, both because Venus's orbit

5280-483: Is expressed relative to its prime meridian . The original prime meridian passed through the radar-bright spot at the centre of the oval feature Eve, located south of Alpha Regio. After the Venera missions were completed, the prime meridian was redefined to pass through the central peak in the crater Ariadne on Sedna Planitia . The stratigraphically oldest tessera terrains have consistently lower thermal emissivity than

5456-636: Is far from certain. Studies reported on 26 October 2023 suggest for the first time that Venus may have had plate tectonics during ancient times and, as a result, may have had a more habitable environment , possibly one capable of sustaining life . Venus has gained interest as a case for research into the development of Earth-like planets and their habitability . Much of the Venusian surface appears to have been shaped by volcanic activity. Venus has several times as many volcanoes as Earth, and it has 167 large volcanoes that are over 100 km (60 mi) across. The only volcanic complex of this size on Earth

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5632-576: Is faster due to its closer proximity to the Sun and because objects would require higher orbital eccentricities to collide with the planet. In 2008 and 2009, the first direct evidence for ongoing volcanism was observed by Venus Express , in the form of four transient localized infrared hot spots within the rift zone Ganis Chasma , near the shield volcano Maat Mons . Three of the spots were observed in more than one successive orbit. These spots are thought to represent lava freshly released by volcanic eruptions. The actual temperatures are not known, because

5808-496: Is for a third category, those motivated by economic concerns — which is where Burke fits in. The novel contains an early description of a mobile phone : Matt dug a candy bar out of his pouch, split it and gave half to Jarman, who accepted it gratefully. "You're a pal, Matt, I've been living on my own fat ever since breakfast -- and that's risky. Say, your telephone is sounding. "Oh!" Matt fumbled in his pouch and got out his phone. "Hello?" The phone "was limited by its short range to

5984-462: Is formed by sulphur dioxide and water through a chemical reaction resulting in sulfuric acid hydrate. Additionally, the clouds consist of approximately 1% ferric chloride . Other possible constituents of the cloud particles are ferric sulfate , aluminium chloride and phosphoric anhydride . Clouds at different levels have different compositions and particle size distributions. These clouds reflect, similar to thick cloud cover on Earth, about 70% of

6160-452: Is induced by an interaction between the ionosphere and the solar wind , rather than by an internal dynamo as in the Earth's core . Venus's small induced magnetosphere provides negligible protection to the atmosphere against solar and cosmic radiation . The lack of an intrinsic magnetic field on Venus was surprising, given that it is similar to Earth in size and was expected to contain

6336-486: Is manned by a certain sort of person, the man of ideals (its motto is Quis custodiet ipsos custodes? ). In contrast, the Marines, the service branch which deals with ordinary military affairs, are trained to prize unquestioning loyalty and bravery as the highest ideals, and are deliberately recruited from the type of person who seeks glory and excitement. Matt belongs to the former category. The Merchant Service, by implication,

6512-404: Is most likely at least partially liquid because the two planets have been cooling at about the same rate, although a completely solid core cannot be ruled out. The slightly smaller size of Venus means pressures are 24% lower in its deep interior than Earth's. The predicted values for the moment of inertia based on planetary models suggest a core radius of 2,900–3,450 km. This is in line with

6688-432: Is not known with certainty, but speculation has ranged from elemental tellurium to lead sulfide ( galena ). Although Venus has no seasons, in 2019 astronomers identified a cyclical variation in sunlight absorption by the atmosphere, possibly caused by opaque, absorbing particles suspended in the upper clouds. The variation causes observed changes in the speed of Venus's zonal winds and appears to rise and fall in time with

6864-863: Is recent evidence of lava flow on Venus (2024), such as flows on Sif Mons, a shield volcano, and on Niobe Planitia, a flat plain. There are visible calderas . The planet has few impact craters , demonstrating that the surface is relatively young, at 300–600   million years old. Venus has some unique surface features in addition to the impact craters, mountains, and valleys commonly found on rocky planets. Among these are flat-topped volcanic features called " farra ", which look somewhat like pancakes and range in size from 20 to 50 km (12 to 31 mi) across, and from 100 to 1,000 m (330 to 3,280 ft) high; radial, star-like fracture systems called "novae"; features with both radial and concentric fractures resembling spider webs, known as " arachnoids "; and "coronae", circular rings of fractures sometimes surrounded by

7040-406: Is speculation on the possibility that life exists in the upper cloud layers of Venus, 50 km (30 mi) up from the surface, where the atmospheric conditions are the most Earth-like in the Solar System, with temperatures ranging between 303 and 353 K (30 and 80 °C; 86 and 176 °F), and the pressure and radiation being about the same as at Earth's surface, but with acidic clouds and

7216-420: Is that the absence of a late, large impact on Venus ( contra the Earth's "Moon-forming" impact) left the core of Venus stratified from the core's incremental formation, and without the forces to initiate/sustain convection, and thus a "geodynamo". The weak magnetosphere around Venus means that the solar wind is interacting directly with its outer atmosphere. Here, ions of hydrogen and oxygen are being created by

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7392-459: Is the Big Island of Hawaii. More than 85,000 volcanoes on Venus were identified and mapped. This is not because Venus is more volcanically active than Earth, but because its crust is older and is not subject to the same erosion process. Earth's oceanic crust is continually recycled by subduction at the boundaries of tectonic plates, and has an average age of about 100 million years, whereas

7568-496: Is visible in dark skies long after sunset. As the brightest point-like object in the sky, Venus is a commonly misreported " unidentified flying object ". As it orbits the Sun, Venus displays phases like those of the Moon in a telescopic view. The planet appears as a small and "full" disc when it is on the opposite side of the Sun (at superior conjunction ). Venus shows a larger disc and "quarter phase" at its maximum elongations from

7744-417: Is −4.14 with a standard deviation of 0.31. The brightest magnitude occurs during the crescent phase about one month before or after an inferior conjunction. Venus fades to about magnitude −3 when it is backlit by the Sun. The planet is bright enough to be seen in broad daylight, but is more easily visible when the Sun is low on the horizon or setting. As an inferior planet , it always lies within about 47° of

7920-482: The Magellan spacecraft imaged a highly reflective substance at the tops of the highest mountain peaks, a " Venus snow " that bore a strong resemblance to terrestrial snow. This substance likely formed from a similar process to snow, albeit at a far higher temperature. Too volatile to condense on the surface, it rose in gaseous form to higher elevations, where it is cooler and could precipitate. The identity of this substance

8096-701: The Oxford English Dictionary , though by 2014 Oxford noted that, in American English, the phrase had also recouped the positive connotations originally meant by Heinlein and Joseph Greene, the Tom Corbett, Space Cadet writer: "An enthusiast for space travel, typically a young person." Venus Venus is the second planet from the Sun . It is a terrestrial planet and is the closest in mass and size to its orbital neighbour Earth . Venus has by far

8272-566: The Tom Corbett, Space Cadet comic books, television series, radio show, comic strip, and novels that were popular in the early 1950s. Greene had originally submitted a radio script for "Tom Ranger and the Space Cadets" on January 16, 1946, but it remained unperformed when Heinlein's novel was published. Heinlein influenced the evolution of "Tom Ranger" into "Tom Corbett" and launched his student astronaut title's common mention; they share credit for

8448-490: The 15th Amendment (1870) that gave black males the right to vote (only males could vote in the U.S. at the time). From 1865 to 1877, the United States underwent a turbulent Reconstruction era during which the federal government tried to establish free labor and the civil rights of freedmen in the South after the end of slavery. Many whites resisted the social changes, leading to the formation of insurgent movements such as

8624-688: The American Civil War , eight serving presidents had owned slaves , almost four million black people remained enslaved in the South , generally only white men with property could vote, and the Naturalization Act of 1790 limited U.S. citizenship to whites . Following the Civil War, three constitutional amendments were passed, including the 13th Amendment (1865) that ended slavery; the 14th Amendment (1869) that gave black people citizenship, adding their total for Congressional apportionment ; and

8800-786: The Ku Klux Klan (KKK), whose members attacked black and white Republicans in order to maintain white supremacy . In 1871, President Ulysses S. Grant , the U.S. Army, and U.S. Attorney General Amos T. Akerman , initiated a campaign to repress the KKK under the Enforcement Acts . Some states were reluctant to enforce the federal measures of the act. In addition, by the early 1870s, other white supremacist and insurgent paramilitary groups arose that violently opposed African-American legal equality and suffrage, intimidating and suppressing black voters, and assassinating Republican officeholders. However, if

8976-813: The March on Washington in 1963, moderates in the movement worked with the United States Congress to achieve the passage of several significant pieces of federal legislation that authorized oversight and enforcement of civil rights laws. The Civil Rights Act of 1964 banned all discrimination based on race, color, religion, sex, and national origin, including in schools, employment, and public accommodations . The Voting Rights Act of 1965 restored and protected voting rights for minorities and authorized oversight of registration and elections in areas with historic under-representation of minority voters. The Fair Housing Act of 1968 forbade property owners from discriminating in

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9152-419: The Sun . Venus "overtakes" Earth every 584 days as it orbits the Sun. As it does so, it changes from the "Evening Star", visible after sunset, to the "Morning Star", visible before sunrise. Although Mercury, the other inferior planet, reaches a maximum elongation of only 28° and is often difficult to discern in twilight, Venus is hard to miss when it is at its brightest. Its greater maximum elongation means it

9328-641: The Tuskegee Institute , to dine at the White House , making him the first African American to attend an official dinner there. "The invitation was roundly criticized by southern politicians and newspapers." Washington persuaded the president to appoint more blacks to federal posts in the South and to try to boost African-American leadership in state Republican organizations. However, these actions were resisted by both white Democrats and white Republicans as an unwanted federal intrusion into state politics. During

9504-534: The civil rights of all Americans. After the American Civil War and subsequent abolition of slavery in the southern states in 1865, the three Reconstruction Amendments to the United States Constitution had granted emancipation and constitutional rights of citizenship to all African Americans, the majority of whom had recently been enslaved. For a short period of time, African-American men voted and held political office, but as time went on Blacks in

9680-401: The decreasing eccentricity of Earth's orbit , the minimum distances will become greater over tens of thousands of years. From the year   1 to 5383, there are 526 approaches less than 40 million km (25 million mi); then, there are none for about 60,158 years. While Venus approaches Earth the closest, Mercury is more often the closest to Earth of all planets. Venus has

9856-422: The dissociation of water molecules from ultraviolet radiation. The solar wind then supplies energy that gives some of these ions sufficient velocity to escape Venus's gravity field. This erosion process results in a steady loss of low-mass hydrogen, helium, and oxygen ions, whereas higher-mass molecules, such as carbon dioxide, are more likely to be retained. Atmospheric erosion by the solar wind could have led to

10032-492: The 16-year period between the Magellan spacecraft and Venus Express visits, with a difference of about 6.5   minutes. Because of the retrograde rotation, the length of a solar day on Venus is significantly shorter than the sidereal day, at 116.75 Earth days (making the Venusian solar day shorter than Mercury 's 176 Earth days — the 116-day figure is close to the average number of days it takes Mercury to slip underneath

10208-425: The 1950s and 1960s, the nonviolent protesting of the civil rights movement caused definite tension, which gained national attention. In order to prepare for protests physically and psychologically, demonstrators received training in nonviolence. According to former civil rights activist Bruce Hartford, there are two main components of nonviolence training. There is the philosophical method, which involves understanding

10384-458: The 1960s, an "eccentric person disconnected with reality" (often implying an intimacy with hallucinogenic drugs) although by the 2010s, drug use was rarely implied by this phrase, nor was low intelligence implied; "space cadet" was more simply associated with "spacing out," wandering from present concerns, especially of others present, and being a "space case." Both the "trainee astronaut" and "person regarded as being out of touch with reality" entered

10560-558: The Earth in its orbit [the number of days of Mercury's synodic orbital period]). One Venusian year is about 1.92   Venusian solar days. To an observer on the surface of Venus, the Sun would rise in the west and set in the east, although Venus's opaque clouds prevent observing the Sun from the planet's surface. Venus may have formed from the solar nebula with a different rotation period and obliquity, reaching its current state because of chaotic spin changes caused by planetary perturbations and tidal effects on its dense atmosphere,

10736-672: The Montgomery Improvement Association, joined with other church leaders who had led similar boycott efforts, such as C. K. Steele of Tallahassee and T. J. Jemison of Baton Rouge, and other activists such as Fred Shuttlesworth , Ella Baker , A. Philip Randolph , Bayard Rustin and Stanley Levison , to form the Southern Christian Leadership Conference (SCLC). The SCLC, with its headquarters in Atlanta , Georgia , did not attempt to create

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10912-506: The Montgomery bus boycott to demand a bus system in which passengers would be treated equally. The organization was led by Jo Ann Robinson, a member of the Women's Political Council who had been waiting for the opportunity to boycott the bus system. Following Rosa Parks' arrest, Jo Ann Robinson mimeographed 52,500 leaflets calling for a boycott. They were distributed around the city and helped gather

11088-491: The NAACP and the national civil rights movement obtained federal court orders to integrate the prestigious Little Rock Central High School in September, 1957. The Nine faced intense harassment and threats of violence from white parents and students, as well as organized white supremacy groups. The enraged opposition emphasized miscegenation as the threat to white society. Arkansas Governor , Orval Faubus , claiming his only goal

11264-517: The Nine were teased and ridiculed every day. In the city compromise efforts all failed and political tensions continued to fester. A year later in September 1958 the Supreme Court ruled that all the city's high schools had to be integrated immediately. Governor Faubus and the legislature responded by immediately shutting down all the public high schools in the city for the entire 1958–1959 school year, despite

11440-626: The RCNL, Howard led campaigns to expose brutality by the Mississippi state highway patrol and to encourage blacks to make deposits in the black-owned Tri-State Bank of Nashville which, in turn, gave loans to civil rights activists who were victims of a "credit squeeze" by the White Citizens' Councils . After Claudette Colvin was arrested for not giving up her seat on a Montgomery, Alabama bus in March 1955,

11616-809: The Republican to the Democratic Party, especially because of opportunities under the New Deal of the Franklin D. Roosevelt administration during the Great Depression in the 1930s. Substantially under pressure from African-American supporters who began the March on Washington Movement , President Roosevelt issued the first federal order banning discrimination and created the Fair Employment Practice Committee . After both World Wars, black veterans of

11792-496: The South were increasingly deprived of civil rights, often under racist Jim Crow laws , and were subjected to discrimination and sustained violence by White supremacists . African Americans who moved to the North to enhance their prospects in the Great Migration also faced barriers in employment and housing. Over the following century, various efforts were made by African Americans to secure their legal and civil rights, such as

11968-430: The South." From 1910 to 1970, blacks sought better lives by migrating north and west out of the South. A total of nearly seven million blacks left the South in what was known as the Great Migration , most during and after World War II. So many people migrated that the demographics of some previously black-majority states changed to a white majority (in combination with other developments). The rapid influx of blacks altered

12144-487: The Sun and thus receives only 25% of Mercury's solar irradiance , of 2,600 W/m (double that of Earth). Because of its runaway greenhouse effect , Venus has been identified by scientists such as Carl Sagan as a warning and research object linked to climate change on Earth. Venus's atmosphere is rich in primordial noble gases compared to that of Earth. This enrichment indicates an early divergence from Earth in evolution. An unusually large comet impact or accretion of

12320-470: The Sun's 11-year sunspot cycle . The existence of lightning in the atmosphere of Venus has been controversial since the first suspected bursts were detected by the Soviet Venera probes . In 2006–07, Venus Express clearly detected whistler mode waves , the signatures of lightning. Their intermittent appearance indicates a pattern associated with weather activity. According to these measurements,

12496-422: The Sun, and appears at its brightest in the night sky. The planet presents a much larger thin "crescent" in telescopic views as it passes along the near side between Earth and the Sun. Venus displays its largest size and "new phase" when it is between Earth and the Sun (at inferior conjunction). Its atmosphere is visible through telescopes by the halo of sunlight refracted around it. The phases are clearly visible in

12672-539: The Sun. This results in Venus transiting above Earth in a sequence of currently 8 years , 105.5 years , 8 years and 121.5 years , forming cycles of 243 years . American Civil Rights Movement 1954–1959 1960–1963 1964–1968 The civil rights movement was a social movement and campaign in the United States from 1954 to 1968 that aimed to abolish legalized racial segregation , discrimination , and disenfranchisement in

12848-454: The Venusian surface is covered by smooth, volcanic plains, consisting of 70% plains with wrinkle ridges and 10% smooth or lobate plains. Two highland "continents" make up the rest of its surface area, one lying in the planet's northern hemisphere and the other just south of the equator. The northern continent is called Ishtar Terra after Ishtar , the Babylonian goddess of love, and is about

13024-590: The Venusian surface is estimated to be 300–600   million years old. Several lines of evidence point to ongoing volcanic activity on Venus. Sulfur dioxide concentrations in the upper atmosphere dropped by a factor of 10 between 1978 and 1986, jumped in 2006, and again declined 10-fold. This may mean that levels had been boosted several times by large volcanic eruptions. It has been suggested that Venusian lightning (discussed below) could originate from volcanic activity (i.e. volcanic lightning ). In January 2020, astronomers reported evidence that suggests that Venus

13200-462: The annual Hampton Negro Conference in Virginia, said that "...the lines along most of the avenues of wage-earning are more rigidly drawn in the North than in the South. There seems to be an apparent effort throughout the North, especially in the cities to debar the colored worker from all the avenues of higher remunerative labor, which makes it more difficult to improve his economic condition even than in

13376-780: The appointment of African American David Jones to the school board in 1953, convinced numerous white and black citizens that Greensboro was heading in a progressive direction. Integration in Greensboro occurred rather peacefully compared to the process in Southern states such as Alabama, Arkansas , and Virginia where " massive resistance " was practiced by top officials and throughout the states. In Virginia, some counties closed their public schools rather than integrate, and many white Christian private schools were founded to accommodate students who used to go to public schools. Even in Greensboro, much local resistance to desegregation continued, and in 1969,

13552-411: The atmosphere before reaching the ground. Without data from reflection seismology or knowledge of its moment of inertia , little direct information is available about the internal structure and geochemistry of Venus. The similarity in size and density between Venus and Earth suggests that they share a similar internal structure: a core , mantle , and crust . Like that of Earth, the Venusian core

13728-474: The atmosphere of Venus. On 29 January 2013, ESA scientists reported that the ionosphere of Venus streams outwards in a manner similar to "the ion tail seen streaming from a comet under similar conditions." In December 2015, and to a lesser extent in April and May 2016, researchers working on Japan's Akatsuki mission observed bow-shaped objects in the atmosphere of Venus. This was considered direct evidence of

13904-443: The atmosphere. Later research attributed the spectroscopic signal that was interpreted as phosphine to sulphur dioxide, or found that in fact there was no absorption line. Thermal inertia and the transfer of heat by winds in the lower atmosphere mean that the temperature of Venus's surface does not vary significantly between the planet's two hemispheres, those facing and not facing the Sun, despite Venus's slow rotation. Winds at

14080-496: The attack. The mentor uses this scenario to force Matt to confront the personal and political issues involved in the institutional control of atomic weapons in a more mature way. Written almost a decade before the American Civil Rights Movement , and at a time when non-white characters were almost entirely absent from science fiction, the book also explores the theme of racism , both literally, in discussions about

14256-431: The attention of civil rights leaders. After the city rejected many of its suggested reforms, the NAACP, led by E. D. Nixon , pushed for full desegregation of public buses. With the support of most of Montgomery's 50,000 African Americans, the boycott lasted for 381 days, until the local ordinance segregating African Americans and whites on public buses was repealed. Ninety percent of African Americans in Montgomery partook in

14432-462: The boycott made its spokesman Martin Luther King Jr. , a nationally known figure. It also inspired other bus boycotts, such as the successful Tallahassee, Florida boycott of 1956–57. This movement also sparked the 1956 Sugar Bowl riots in Atlanta which later became a major organizing center of the civil rights movement, with Martin Luther King Jr. In 1957, King and Ralph Abernathy , the leaders of

14608-539: The boycotts, which reduced bus revenue significantly, as they comprised the majority of the riders. This movement also sparked riots leading up to the 1956 Sugar Bowl . In November 1956, the United States Supreme Court upheld a district court ruling in the case of Browder v. Gayle and ordered Montgomery's buses desegregated, ending the boycott. Local leaders established the Montgomery Improvement Association to focus their efforts. Martin Luther King Jr.

14784-399: The bus in Montgomery, Alabama. Parks later informed Till's mother that her decision to stay in her seat was guided by the image she still vividly recalled of Till's brutalized remains. The glass topped casket that was used for Till's Chicago funeral was found in a cemetery garage in 2009. Till had been reburied in a different casket after being exhumed in 2005. Till's family decided to donate

14960-460: The carbon dioxide air. Venus's atmosphere could also have a potential thermal habitable zone at elevations of 54 to 48 km, with lower elevations inhibiting cell growth and higher elevations exceeding evaporation temperature. The putative detection of an absorption line of phosphine in Venus's atmosphere, with no known pathway for abiotic production, led to speculation in September 2020 that there could be extant life currently present in

15136-453: The case known as Brown II , the Court ordered segregation to be phased out over time, "with all deliberate speed". Brown v. Board of Education of Topeka, Kansas (1954) did not overturn Plessy v. Ferguson (1896). Plessy v. Ferguson was segregation in transportation modes. Brown v. Board of Education dealt with segregation in education. Brown v. Board of Education did set in motion

15312-506: The city of Anniston, Alabama , two black ministers were brutally beaten for attempting to integrate the public library. Though there was resistance and violence, the integration of libraries was generally quicker than the integration of other public institutions. The situation for blacks outside the South was somewhat better (in most states they could vote and have their children educated, though they still faced discrimination in housing and jobs). In 1900 Reverend Matthew Anderson, speaking at

15488-804: The civil rights movement's peak in the mid-1960s, and still faced discrimination in jobs, housing, education and politics. A wave of riots and protests in Black communities in the 1960s, including in Los Angeles in 1965 , in Newark in 1967 , and in Chicago in 1968 following King's assassination lessened support from the White middle class. By the early 21st century, though " affirmative action " programs had expanded opportunities for Black and other minorities, Black income levels and life expectancy remained lower than that of Whites. Before

15664-562: The civil rights movements of 1865–1896 and of 1896–1954 . The movement was characterized by nonviolent mass protests and civil disobedience following highly publicized events such as the lynching of Emmett Till in 1955. These included economic boycotts such as the Montgomery bus boycott , " sit-ins " in Greensboro and Nashville , a series of protests during the Birmingham campaign , and

15840-408: The closest between any two Solar System planets, approaching each other in synodic periods of 1.6 years. Venus and Earth have the lowest difference in gravitational potential of any pair of Solar System planets. This allows Venus to be the most accessible destination and a useful gravity assist waypoint for interplanetary flights from Earth. Venus figures prominently in human culture and in

16016-622: The constitutionality of those state laws that required racial segregation in public facilities in its 1896 decision Plessy v. Ferguson , legitimizing them through the " separate but equal " doctrine. Segregation, which began with slavery, continued with Jim Crow laws, with signs used to show blacks where they could legally walk, talk, drink, rest, or eat. For those places that were racially mixed, non-whites had to wait until all white customers were served first. Elected in 1912, President Woodrow Wilson gave in to demands by Southern members of his cabinet and ordered segregation of workplaces throughout

16192-420: The core because the bottom of the liquid layer is much higher in temperature than the top. On Venus, a global resurfacing event may have shut down plate tectonics and led to a reduced heat flux through the crust. This insulating effect would cause the mantle temperature to increase, thereby reducing the heat flux out of the core. As a result, no internal geodynamo is available to drive a magnetic field. Instead,

16368-493: The cosmopolitan racial makeup of the (all-male) Patrol, and metaphorically, in its description of conflict with the Venerians. Venus is described as intensely hot and (incorrectly, as is now known) swampy, but habitable. The Venerians are at first thought to be primitive, but it is later revealed that they have a high level of technological sophistication, though developed along radically different lines than that of humans. There

16544-521: The country, which was most commonly employed against African Americans . The movement had origins in the Reconstruction era during the late 19th century, and had modern roots in the 1940s. After years of direct actions and grassroots protests, the movement made its largest legislative and judicial gains during the 1960s. The movement's major nonviolent resistance and civil disobedience campaigns eventually secured new protections in federal law for

16720-513: The court majority opinion that Segregation of white and colored children in public schools has a detrimental effect upon the colored children. The impact is greater when it has the sanction of the law; for the policy of separating the races is usually interpreted as denoting the inferiority of the Negro group. The lawyers from the NAACP had to gather plausible evidence in order to win the case of Brown vs. Board of Education . Their method of addressing

16896-552: The crust. Then, over a period of about 100   million years, subduction occurs on an enormous scale, completely recycling the crust. Venusian craters range from 3 to 280 km (2 to 174 mi) in diameter. No craters are smaller than 3   km, because of the effects of the dense atmosphere on incoming objects. Objects with less than a certain kinetic energy are slowed so much by the atmosphere that they do not create an impact crater. Incoming projectiles less than 50 m (160 ft) in diameter will fragment and burn up in

17072-412: The daytime with overcast clouds". Strong 300 km/h (185 mph) winds at the cloud tops go around Venus about every four to five Earth days. Winds on Venus move at up to 60 times the speed of its rotation, whereas Earth's fastest winds are only 10–20% rotation speed. The surface of Venus is effectively isothermal ; it retains a constant temperature not only between the two hemispheres but between

17248-579: The daytime. French emperor Napoleon Bonaparte once witnessed a daytime apparition of the planet while at a reception in Luxembourg . Another historical daytime observation of the planet took place during the inauguration of the American president Abraham Lincoln in Washington, D.C., on 4   March 1865. A transit of Venus is the appearance of Venus in front of the Sun, during inferior conjunction . Since

17424-719: The demand by issuing Executive Order 8802 , which barred racial discrimination and created an agency to oversee compliance with the order. The strategy of public education, legislative lobbying, and litigation that had typified the civil rights movement during the first half of the 20th century broadened after Brown to a strategy that emphasized " direct action ": boycotts, sit-ins , Freedom Rides , marches or walks, and similar tactics that relied on mass mobilization, nonviolent resistance, standing in line, and, at times, civil disobedience. Churches, local grassroots organizations, fraternal societies, and black-owned businesses mobilized volunteers to participate in broad-based actions. This

17600-456: The demographics of Northern and Western cities; happening at a period of expanded European, Hispanic, and Asian immigration, it added to social competition and tensions, with the new migrants and immigrants battling for a place in jobs and housing. Reflecting social tensions after World War I, as veterans struggled to return to the workforce and labor unions were organizing, the Red Summer of 1919

17776-510: The densest atmosphere of the terrestrial planets, composed mostly of carbon dioxide with a thick, global sulfuric acid cloud cover. At the surface it has a mean temperature of 737 K (464 °C; 867 °F) and a pressure 92 times that of Earth's at sea level. These extreme conditions compress carbon dioxide into a supercritical state at Venus's surface. Internally, Venus has a core ,  mantle , and  crust . Venus lacks an internal dynamo, and its weakly induced magnetosphere

17952-586: The doctrine of separate but equal . At the culmination of a legal strategy pursued by African Americans, in 1954 the Supreme Court struck down the underpinnings of laws that allowed racial discrimination as unconstitutional in Brown v. Board of Education . The Warren Court made further pro-civil rights rulings in cases such as Browder v. Gayle (1956) and Loving v. Virginia (1967), banning segregation in public schools and public transport, and striking down all state laws against interracial marriage . Following

18128-578: The early solar system orbital dynamics have shown that the eccentricity of the Venus orbit may have been substantially larger in the past, reaching values as high as 0.31 and possibly impacting early climate evolution. All planets in the Solar System orbit the Sun in an anticlockwise direction as viewed from above Earth's north pole. Most planets rotate on their axes in an anticlockwise direction, but Venus rotates clockwise in retrograde rotation once every 243 Earth days—the slowest rotation of any planet. This Venusian sidereal day lasts therefore longer than

18304-575: The entire process of developing and training the mental, physical and moral powers and capabilities of human beings". Risa Goluboff wrote that the NAACP's intention was to show the Courts that African American children were the victims of school segregation and their futures were at risk. The Court ruled that both Plessy v. Ferguson (1896), which had established the "separate but equal" standard in general, and Cumming v. Richmond County Board of Education (1899), which had applied that standard to schools,

18480-442: The equator and the poles. Venus's minute axial tilt —less than 3°, compared to 23° on Earth—also minimizes seasonal temperature variation. Altitude is one of the few factors that affect Venusian temperatures. The highest point on Venus, Maxwell Montes , is therefore the coolest point on Venus, with a temperature of about 655 K (380 °C; 715 °F) and an atmospheric pressure of about 4.5 MPa (45 bar). In 1995,

18656-415: The existence of perhaps the largest stationary gravity waves in the solar system. Venus orbits the Sun at an average distance of about 0.72  AU (108 million  km ; 67 million  mi ), and completes an orbit every 224.7 days. Although all planetary orbits are elliptical , Venus's orbit is currently the closest to circular, with an eccentricity of less than 0.01. Simulations of

18832-402: The federal government found the city was not in compliance with the 1964 Civil Rights Act. Transition to a fully integrated school system did not begin until 1971. Many Northern cities also had de facto segregation policies, which resulted in a vast gulf in educational resources between black and white communities. In Harlem , New York, for example, neither a single new school was built since

19008-547: The federal government. The early 20th century is a period often referred to as the " nadir of American race relations ", when the number of lynchings was highest. While tensions and civil rights violations were most intense in the South, social discrimination affected African Americans in other regions as well. At the national level, the Southern bloc controlled important committees in Congress, defeated passage of federal laws against lynching, and exercised considerable power beyond

19184-514: The first Citizenship Schools in South Carolina 's Sea Islands . They taught literacy to enable blacks to pass voting tests. The program was an enormous success and tripled the number of black voters on Johns Island . SCLC took over the program and duplicated its results elsewhere. In the spring of 1951, black students in Virginia protested their unequal status in the state's segregated educational system. Students at Moton High School protested

19360-621: The first observation-based estimate of 3,500 km. The principal difference between the two planets is the lack of evidence for plate tectonics on Venus, possibly because its crust is too strong to subduct without water to make it less viscous . This results in reduced heat loss from the planet, preventing it from cooling and providing a likely explanation for its lack of an internally generated magnetic field . Instead, Venus may lose its internal heat in periodic major resurfacing events. In 1967, Venera 4 found Venus's magnetic field to be much weaker than that of Earth. This magnetic field

19536-400: The first soft landing on another planet by Venera 7 in 1970. These probes demonstrated the extreme surface conditions, an insight that has informed predictions about global warming on Earth. This finding ended the theories and then popular science fiction about Venus being a habitable or inhabited planet. Venus is one of the four terrestrial planets in the Solar System, meaning that it

19712-465: The following 200 years , but most were determined to be stars in the vicinity. Alex Alemi's and David Stevenson 's 2006 study of models of the early Solar System at the California Institute of Technology shows Venus likely had at least one moon created by a huge impact event billions of years ago. About 10   million   years later, according to the study, another impact reversed

19888-604: The funeral in Jet is credited as a crucial moment in the civil rights era for displaying in vivid detail the violent racism that was being directed at black people in America. In a column for The Atlantic , Vann R. Newkirk wrote: "The trial of his killers became a pageant illuminating the tyranny of white supremacy ". The state of Mississippi tried two defendants, but they were speedily acquitted by an all-white jury . "Emmett's murder," historian Tim Tyson writes, "would never have become

20064-469: The future overturning of 'separate but equal'. On May 18, 1954, Greensboro, North Carolina , became the first city in the South to publicly announce that it would abide by the Supreme Court's Brown v. Board of Education ruling. "It is unthinkable,' remarked School Board Superintendent Benjamin Smith, 'that we will try to [override] the laws of the United States." This positive reception for Brown, together with

20240-401: The harm it did to all the students. The decision to integrate the school was a landmark event in the civil rights movement, and the students' bravery and determination in the face of violent opposition is remembered as a key moment in American history. The city and state were entangled in very expensive legal disputes for decades, while suffering a reputation for hatred and obstruction. During

20416-429: The heat from the core is reheating the crust. One possibility is that Venus has no solid inner core, or that its core is not cooling, so that the entire liquid part of the core is at approximately the same temperature. Another possibility is that its core has already been completely solidified. The state of the core is highly dependent on the concentration of sulphur , which is unknown at present. Another possibility

20592-472: The history of astronomy. Orbiting inferiorly (inside of Earth's orbit), it always appears close to the Sun in Earth's sky, as either a "morning star" or an "evening star". While this is also true for Mercury , Venus appears more prominent, since it is the third brightest object in Earth's sky after the Moon and the Sun. In 1961, Venus became the target of the first interplanetary flight, Venera 1 , followed by many essential interplanetary firsts , such as

20768-399: The hypothesis of a spin-orbit resonance with Earth has been discounted. Venus has no natural satellites. It has several trojan asteroids : the quasi-satellite 524522 Zoozve and two other temporary trojans, 2001 CK 32 and 2012 XE 133 . In the 17th century, Giovanni Cassini reported a moon orbiting Venus, which was named Neith and numerous sightings were reported over

20944-427: The individual person's attitude and mental response to crises and violence" (Civil Rights Movement Archive). Hartford and activists like him, who trained in tactical nonviolence, considered it necessary in order to ensure physical safety, instill discipline, teach demonstrators how to demonstrate, and form mutual confidence among demonstrators (Civil Rights Movement Archive). For many, the concept of nonviolent protest

21120-426: The issue of school segregation was to enumerate several arguments. One pertained to having exposure to interracial contact in a school environment. It was argued that interracial contact would, in turn, help prepare children to live with the pressures that society exerts in regard to race and thereby afford them a better chance of living in a democracy. In addition, another argument emphasized how "'education' comprehends

21296-455: The landmark Supreme Court case of Smith v. Allwright (1944), which prohibited white primaries , progress was made in increasing black political participation in the Rim South and Acadiana – although almost entirely in urban areas and a few rural localities where most blacks worked outside plantations. The status quo ante of excluding African Americans from the political system lasted in

21472-441: The last African Americans were elected to Congress from the South before disenfranchisement of blacks by states throughout the region, as described below. From 1890 to 1908, southern states passed new constitutions and laws to disenfranchise African Americans and many Poor Whites by creating barriers to voter registration; voting rolls were dramatically reduced as blacks and poor whites were forced out of electoral politics. After

21648-482: The leadership of Walter Reuther , the United Auto Workers donated $ 75,000 to help pay for the NAACP's efforts at the Supreme Court. On May 17, 1954, the U.S. Supreme Court under Chief Justice Earl Warren ruled unanimously in Brown v. Board of Education of Topeka, Kansas , that mandating, or even permitting, public schools to be segregated by race was unconstitutional . Chief Justice Warren wrote in

21824-402: The lightning rate is at least half that on Earth, however other instruments have not detected lightning at all. The origin of any lightning remains unclear, but could originate from clouds or Venusian volcanoes . In 2007, Venus Express discovered that a huge double atmospheric polar vortex exists at the south pole. Venus Express discovered, in 2011, that an ozone layer exists high in

22000-492: The loss of most of Venus's water during the first billion years after it formed. However, the planet may have retained a dynamo for its first 2–3 billion years, so the water loss may have occurred more recently. The erosion has increased the ratio of higher-mass deuterium to lower-mass hydrogen in the atmosphere 100 times compared to the rest of the solar system. Venus has a dense atmosphere composed of 96.5% carbon dioxide , 3.5% nitrogen—both exist as supercritical fluids at

22176-514: The lowest gravitational potential difference to Earth than any other planet, needing the lowest delta-v to transfer between them. Tidally Venus exerts the third strongest tidal force on Earth, after the Moon and the Sun, though significantly less. To the naked eye , Venus appears as a white point of light brighter than any other planet or star (apart from the Sun). The planet's mean apparent magnitude

22352-419: The method of nonviolence and why it is considered useful, and there is the tactical method, which ultimately teaches demonstrators "how to be a protestor—how to sit-in, how to picket, how to defend yourself against attack, giving training on how to remain cool when people are screaming racist insults into your face and pouring stuff on you and hitting you" (Civil Rights Movement Archive). The philosophical basis of

22528-466: The military pressed for full civil rights and often led activist movements. In 1948, President Harry Truman issued Executive Order 9981 , which ended segregation in the military . Housing segregation became a nationwide problem following the Great Migration of black people out of the South. Racial covenants were employed by many real estate developers to "protect" entire subdivisions , with

22704-433: The mud. With Thurlow comatose, injured when the lander fell over, Jensen assumes command. He contacts the sentient, usually friendly Venerians, but the entire party is taken captive. They soon find out why. These particular natives had never seen human beings before, until old classmate Burke showed up in a prospecting ship. He had taken the matriarch of the local clan hostage when she refused to give him permission to exploit

22880-474: The need arose, to emulate Rivera and destroy his own Iowa hometown. His father tells him such a need would never arise, since the Patrol's cosmopolitan allegiance is little more than a sham and in fact it is controlled by the "North American Federation" and serves its interests. Later, Matt's mentor in the Patrol makes him understand that if such an unlikely dilemma should arise, his commanding officer would lock him in his room rather than expect him to participate in

23056-432: The neighborhood of an earth-side [i.e. terrestrial] relay office". A cadet avoids having to talk to his family while traveling by packing his phone in luggage. Surveying Heinlein's juvenile novels, Jack Williamson characterized Space Cadet as "a long step forward. ... The characters are stronger [and] the background is carefully built, original, and convincing, the story suspenseful enough." Williamson noted that Heinlein

23232-521: The number of whites in the South. Characteristics of the post-Reconstruction period: African Americans and other ethnic minorities rejected this regime. They resisted it in numerous ways and sought better opportunities through lawsuits, new organizations, political redress, and labor organizing (see the Civil rights movement (1896–1954) ). The National Association for the Advancement of Colored People (NAACP)

23408-404: The orbit of Venus is slightly inclined relative to Earth's orbit, most inferior conjunctions with Earth, which occur every synodic period of 1.6 years, do not produce a transit of Venus above Earth. Consequently, Venus transits above Earth only occur when an inferior conjunction takes place during some days of June or December, the time where the orbits of Venus and Earth cross a straight line with

23584-464: The original casket to the Smithsonian's National Museum of African American Culture and History, where it is now on display. In 2007, Bryant said that she had fabricated the most sensational part of her story in 1955. On December 1, 1955, nine months after a 15-year-old high school student, Claudette Colvin , refused to give up her seat to a white passenger on a public bus in Montgomery, Alabama, and

23760-500: The overcrowded conditions and failing facility. Some local leaders of the NAACP had tried to persuade the students to back down from their protest against the Jim Crow laws of school segregation. When the students did not budge, the NAACP joined their battle against school segregation. The NAACP proceeded with five cases challenging the school systems; these were later combined under what is known today as Brown v. Board of Education . Under

23936-405: The planet underwent a global resurfacing event 300–600   million years ago, followed by a decay in volcanism. Whereas Earth's crust is in continuous motion, Venus is thought to be unable to sustain such a process. Without plate tectonics to dissipate heat from its mantle, Venus instead undergoes a cyclical process in which mantle temperatures rise until they reach a critical level that weakens

24112-421: The planet's spin direction and the resulting tidal deceleration caused the Venusian moon gradually to spiral inward until it collided with Venus. If later impacts created moons, these were removed in the same way. An alternative explanation for the lack of satellites is the effect of strong solar tides, which can destabilize large satellites orbiting the inner terrestrial planets. The orbital space of Venus has

24288-581: The planet's surface with a density 6.5% that of water —and traces of other gases including sulphur dioxide . The mass of its atmosphere is 92 times that of Earth's, whereas the pressure at its surface is about 93 times that at Earth's—a pressure equivalent to that at a depth of nearly 1 km ( 5 ⁄ 8  mi) under Earth's ocean surfaces. The density at the surface is 65 kg/m (4.1 lb/cu ft), 6.5% that of water or 50 times as dense as Earth's atmosphere at 293 K (20 °C; 68 °F) at sea level. The CO 2 -rich atmosphere generates

24464-453: The popularity of both formal and later slang uses of "space cadet." The Tom Corbett, Space Cadet television series and radio show made "space cadet" a household phrase. By 1955, Jackie Gleason spoke the phrase on The Honeymooners television show in an episode called "TV or Not to TV," original airdate October 1, 1955. The popular meanings of "space cadet" later shifted in popular culture away from astronaut-in-training to indicate, by

24640-497: The practice of nonviolence in the American civil rights movement was largely inspired by Mahatma Gandhi 's "non-cooperation" policies during his involvement in the Indian independence movement , which were intended to gain attention so that the public would either "intervene in advance" or "provide public pressure in support of the action to be taken" (Erikson, 415). As Hartford explains it, philosophical nonviolence training aims to "shape

24816-445: The pressure of the lawsuit with a school boycott in 1959. During the boycott, some of the first freedom schools of the period were established. The city responded to the campaign by permitting more open transfers to high-quality, historically white schools. (New York's African-American community, and Northern desegregation activists generally, now found themselves contending with the problem of white flight , however.) Emmett Till ,

24992-446: The primary intent to keep " white " neighborhoods "white". Ninety percent of the housing projects built in the years following World War II were racially restricted by such covenants. Cities known for their widespread use of racial covenants include Chicago , Baltimore , Detroit , Milwaukee , Los Angeles , Seattle , and St. Louis . Said premises shall not be rented, leased, or conveyed to, or occupied by, any person other than of

25168-475: The remainder of the South, especially North Louisiana , Mississippi and Alabama, until national civil rights legislation was passed in the mid-1960s to provide federal enforcement of constitutional voting rights. For more than sixty years, blacks in the South were essentially excluded from politics, unable to elect anyone to represent their interests in Congress or local government. Since they could not vote, they could not serve on local juries. During this period,

25344-618: The rental or sale of housing. African Americans re-entered politics in the South, and the Black Power movement emerged, which criticized leaders of the existing movement for their cooperative attitude and adherence to legalism and nonviolence . Black Power leaders, including within the Black Panther Party , demanded not only legal equality, but also economic self-sufficiency for the community. Support for Black Power came from African Americans who had seen little material improvement since

25520-459: The same time as African Americans were being disenfranchised, white southerners imposed racial segregation by law. Violence against blacks increased, with numerous lynchings through the turn of the century. The system of de jure state-sanctioned racial discrimination and oppression that emerged from the post-Reconstruction South became known as the " Jim Crow " system. The United States Supreme Court made up almost entirely of Northerners, upheld

25696-399: The ship when the armored outer airlock door was open. Before the accident, a researcher on the Pathfinder had found evidence that the planet which blew up to form the asteroids was inhabited by an intelligent species, and that the explosion had been artificial. The captain of the Aes Triplex transfers half the crew to the repaired Pathfinder so that they can take the ship and the news of

25872-475: The size of Australia. Maxwell Montes , the highest mountain on Venus, lies on Ishtar Terra. Its peak is 11 km (7 mi) above the Venusian average surface elevation. The southern continent is called Aphrodite Terra , after the Greek mythological goddess of love, and is the larger of the two highland regions at roughly the size of South America. A network of fractures and faults covers much of this area. There

26048-523: The size of the hot spots could not be measured, but are likely to have been in the 800–1,100 K (527–827 °C; 980–1,520 °F) range, relative to a normal temperature of 740 K (467 °C; 872 °F). In 2023, scientists reexamined topographical images of the Maat Mons region taken by the Magellan orbiter. Using computer simulations, they determined that the topography had changed during an 8-month interval, and concluded that active volcanism

26224-417: The startling discovery back to Earth quickly. With the remainder (including all three cadets), he plots a slower, fuel-efficient, elliptical voyage back to Earth. Then, he receives an urgent message to investigate an incident on Venus. He sends Lieutenant Thurlow and the cadets to the planet's surface. The lander touches down on a sinkhole , giving the crew barely enough time to get out before it disappears in

26400-634: The states failed to implement the acts, the laws allowed the Federal Government to get involved. Many Republican governors were afraid of sending black militia troops to fight the Klan for fear of war. After the disputed election of 1876, which resulted in the end of Reconstruction and the withdrawal of federal troops, whites in the South regained political control of the region's state legislatures. They continued to intimidate and violently attack blacks before and during elections to suppress their voting, but

26576-444: The stranded humans to the carefully preserved Astarte , the legendary first ship to set out for Venus over a century before and thought to have been lost en route. According to the log, the crew perished from disease. With the help of the natives, the cadets recommission the ship and fly it back to Venus's South Pole colony. Dodson is initially disappointed when they are not treated as heroes, but then realizes that what they accomplished

26752-410: The strongest greenhouse effect in the Solar System, creating surface temperatures of at least 735 K (462 °C; 864 °F). This makes the Venusian surface hotter than Mercury 's, which has a minimum surface temperature of 53 K (−220 °C; −364 °F) and maximum surface temperature of 700 K (427 °C; 801 °F), even though Venus is nearly twice Mercury's distance from

26928-443: The sunlight that falls on them back into space, and since they cover the whole planet they prevent visual observation of Venus's surface. The permanent cloud cover means that although Venus is closer than Earth to the Sun, it receives less sunlight on the ground, with only 10% of the received sunlight reaching the surface, resulting in average daytime levels of illumination at the surface of 14,000 lux , comparable to that on Earth "in

27104-459: The surface are slow, moving at a few kilometres per hour, but because of the high density of the atmosphere at the surface, they exert a significant amount of force against obstructions, and transport dust and small stones across the surface. This alone would make it difficult for a human to walk through, even without the heat, pressure, and lack of oxygen. Above the dense CO 2 layer are thick clouds, consisting mainly of sulfuric acid , which

27280-503: The surface. After a period of 600 million to several billion years, solar forcing from rising luminosity of the Sun and possibly large volcanic resurfacing caused the evaporation of the original water and the current atmosphere. A runaway greenhouse effect was created once a critical level of greenhouse gases (including water) was added to its atmosphere. Although the surface conditions on Venus are no longer hospitable to any Earth-like life that may have formed before this event, there

27456-420: The surrounding basaltic plains measured by Venus Express and Magellan , indicating a different, possibly a more felsic , mineral assemblage. The mechanism to generate a large amount of felsic crust usually requires the presence of water ocean and plate tectonics , implying that habitable condition had existed on early Venus with large bodies of water at some point. However, the nature of tessera terrains

27632-432: The time period considered to be the "African-American civil rights" era, the predominant use of protest was nonviolent, or peaceful. Often referred to as pacifism, the method of nonviolence is considered to be an attempt to impact society positively. Although acts of racial discrimination have occurred historically throughout the United States, perhaps the most violent regions have been in the former Confederate states. During

27808-536: The turn of the century, nor did a single nursery school exist – even as the Second Great Migration was causing overcrowding. Existing schools tended to be dilapidated and staffed with inexperienced teachers. Brown helped stimulate activism among New York City parents like Mae Mallory who, with the support of the NAACP, initiated a successful lawsuit against the city and state on Brown 's principles. Mallory and thousands of other parents bolstered

27984-414: The unanimous Supreme Court ruling, many states began to gradually integrate their schools, but some areas of the South resisted by closing public schools altogether. The integration of Southern public libraries followed demonstrations and protests that used techniques seen in other elements of the larger civil rights movement. This included sit-ins, beatings, and white resistance. For example, in 1963 in

28160-503: The white or Caucasian race. While many whites defended their space with violence, intimidation, or legal tactics toward black people, many other whites migrated to more racially homogeneous suburban or exurban regions, a process known as white flight . From the 1930s to the 1960s, the National Association of Real Estate Boards (NAREB) issued guidelines that specified that a realtor "should never be instrumental in introducing to

28336-476: The white-dominated Democratic Party maintained political control of the South. With whites controlling all the seats representing the total population of the South, they had a powerful voting bloc in Congress. The Republican Party —the "party of Lincoln" and the party to which most blacks had belonged—shrank to insignificance except in remote Unionist areas of Appalachia and the Ozarks as black voter registration

28512-413: Was "perfecting the bildungsroman form that shapes the whole series." P. Schuyler Miller gave the book a favorable review as "a first-rate historical novel of the near future," saying "So subtly has the scientific detail been interwoven with plot and action that the reader never realizes how painstakingly it has been worked out." The novel inspired Joseph Greene of Grosset & Dunlap to develop

28688-463: Was a more direct and potentially more rapid means of creating change than the traditional approach of mounting court challenges used by the NAACP and others. In 1952, the Regional Council of Negro Leadership (RCNL), led by T. R. M. Howard , a black surgeon, entrepreneur, and planter organized a successful boycott of gas stations in Mississippi that refused to provide restrooms for blacks. Through

28864-442: Was a subject of speculation until some of its secrets were revealed by planetary science in the 20th century. Venera landers in 1975 and 1982 returned images of a surface covered in sediment and relatively angular rocks. The surface was mapped in detail by Magellan in 1990–91. The ground shows evidence of extensive volcanism, and the sulphur in the atmosphere may indicate that there have been recent eruptions. About 80% of

29040-404: Was a way of life, a culture. However, not everyone agreed with this notion. James Forman, former SNCC (and later Black Panther) member, and nonviolence trainer was among those who did not. In his autobiography, The Making of Black Revolutionaries , Forman revealed his perspective on the method of nonviolence as "strictly a tactic, not a way of life without limitations." Similarly, Bob Moses , who

29216-401: Was also an active member of SNCC , felt that the method of nonviolence was practical. When interviewed by author Robert Penn Warren, Moses said "There's no question that he ( Martin Luther King Jr. ) had a great deal of influence with the masses. But I don't think it's in the direction of love. It's in a practical direction … ." (Who Speaks for the Negro? Warren). According to a 2020 study in

29392-666: Was arrested, Rosa Parks did the same thing. Parks soon became the symbol of the resulting Montgomery bus boycott and received national publicity. She was later hailed as the "mother of the civil rights movement". Parks was secretary of the Montgomery NAACP chapter and had recently returned from a meeting at the Highlander Folk School in Tennessee where nonviolence as a strategy was taught by Myles Horton and others. After Parks' arrest, African Americans gathered and organized

29568-417: Was discovered and retrieved from the river. After Emmett's mother, Mamie Till , came to identify the remains of her son, she decided she wanted to "let the people see what I have seen". Till's mother then had his body taken back to Chicago where she had it displayed in an open casket during the funeral services where many thousands of visitors arrived to show their respects. A later publication of an image at

29744-491: Was elected President of this organization. The lengthy protest attracted national attention for him and the city. His eloquent appeals to Christian brotherhood and American idealism created a positive impression on people both inside and outside the South. The Little Rock Nine were a group of nine students who attended segregated black high schools in Little Rock , the capital of the state of Arkansas. They each volunteered when

29920-600: Was founded in 1909. It fought to end race discrimination through litigation , education, and lobbying efforts. Its crowning achievement was its legal victory in the Supreme Court decision Brown v. Board of Education (1954), when the Warren Court ruled that segregation of public schools in the US was unconstitutional and, by implication, overturned the " separate but equal " doctrine established in Plessy v. Ferguson of 1896. Following

30096-488: Was marked by hundreds of deaths and higher casualties across the U.S. as a result of white race riots against blacks that took place in more than three dozen cities. Urban problems such as crime and disease were blamed on the large influx of Southern blacks to cities in the north and west, based on stereotypes of rural southern African-Americans. Overall, blacks in Northern and Western cities experienced systemic discrimination in

30272-583: Was simply what was expected of Patrolmen. The Patrol is entrusted by the worldwide Earth government with a monopoly on nuclear weapons , and is expected to maintain a credible threat to drop them on Earth from orbit as a deterrent against breaking the peace. Matt, on a visit home, causes a family argument when his parents refuse to believe that the Patrol—;and especially their son—would actually bomb Iowa. The cadets are expected to renounce their loyalty to their respective countries and replace it by

30448-410: Was suppressed. The Republican lily-white movement also gained strength by excluding blacks. Until 1965, the " Solid South " was a one-party system under the white Democrats. Excepting the previously noted historic Unionist strongholds the Democratic Party nomination was tantamount to election for state and local office. In 1901, President Theodore Roosevelt invited Booker T. Washington , president of

30624-458: Was the cause. Almost a thousand impact craters on Venus are evenly distributed across its surface. On other cratered bodies, such as Earth and the Moon, craters show a range of states of degradation. On the Moon, degradation is caused by subsequent impacts, whereas on Earth it is caused by wind and rain erosion. On Venus, about 85% of the craters are in pristine condition. The number of craters, together with their well-preserved condition, indicates

30800-490: Was to preserve the peace, deployed the Arkansas National Guard to prevent the black students from entering the school. Faubus defied federal court orders, whereupon President Dwight D. Eisenhower intervened. He federalized the Arkansas National Guard and sent them home. Then he sent in an elite Army unit to escort the students to school and protect them between classes during the 1957–58 school year. In class, however,

30976-613: Was unconstitutional. The federal government filed a friend of the court brief in the case urging the justices to consider the effect that segregation had on America's image in the Cold War . Secretary of State Dean Acheson was quoted in the brief stating that "The United States is under constant attack in the foreign press, over the foreign radio, and in such international bodies as the United Nations because of various practices of discrimination in this country." The following year, in

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