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175-541: "Aeronautical engineering" was the original term for the field. As flight technology advanced to include vehicles operating in outer space , the broader term " aerospace engineering" has come into use. Aerospace engineering, particularly the astronautics branch, is often colloquially referred to as "rocket science". Flight vehicles are subjected to demanding conditions such as those caused by changes in atmospheric pressure and temperature , with structural loads applied upon vehicle components. Consequently, they are usually

350-614: A rocket-powered aircraft was on August 15, 1957, in the Bell X-1 B, to an altitude of 11.4 miles (18.3 km). On landing, the poorly designed nose landing gear failed, as had happened on about a dozen previous flights of the Bell X-1B. He flew the North American X-15 seven times, including the first flight with the Q-ball system, the first flight of the number   3 X-15 airframe, and

525-424: A spacecraft must travel faster than a sub-orbital spaceflight along an arcing trajectory . The energy required to reach Earth orbital velocity at an altitude of 600 km (370 mi) is about 36  MJ /kg, which is six times the energy needed merely to climb to the corresponding altitude. The escape velocity required to pull free of Earth's gravitational field altogether and move into interplanetary space

700-533: A $ 678 raise in pay to $ 21,653 a year (equivalent to $ 203,338 in 2023), making him NASA's highest-paid astronaut. In Armstrong's final assignment in the Gemini program, he was the back-up Command Pilot for Gemini 11 . Having trained for two flights, Armstrong was quite knowledgeable about the systems and took on a teaching role for the rookie backup pilot, William Anders . The launch was on September 12, 1966, with Conrad and Gordon on board, who successfully completed

875-474: A 10-second pause, Duke acknowledged the landing with, "We copy you down, Eagle ." Armstrong confirmed the landing to Mission Control and the world with the words, "Houston, Tranquility Base here. The Eagle has landed." Aldrin and Armstrong celebrated with a brisk handshake and pat on the back. They then returned to the checklist of contingency tasks, should an emergency liftoff become necessary. After Armstrong confirmed touch down, Duke re-acknowledged, adding

1050-644: A Bachelor of Science degree in Aeronautical Engineering in January 1955. In 1970, he completed his Master of Science degree in Aerospace Engineering at the University of Southern California (USC). He would eventually be awarded honorary doctorates by several universities. Armstrong met Janet Elizabeth Shearon, who was majoring in home economics , at a party hosted by Alpha Chi Omega. According to

1225-532: A T-33, was to evaluate Smith Ranch Dry Lake in Nevada for use as an emergency landing site for the X-15. In his autobiography, Yeager wrote that he knew the lake bed was unsuitable for landings after recent rains, but Armstrong insisted on flying out anyway. As they attempted a touch-and-go , the wheels became stuck and they had to wait for rescue. As Armstrong told the story, Yeager never tried to talk him out of it and they made

1400-475: A comment about the flight crew's relief: "Roger, Tranquility. We copy you on the ground. You got a bunch of guys about to turn blue. We're breathing again. Thanks a lot." During the landing, Armstrong's heart rate ranged from 100 to 150   beats per minute. The flight plan called for a crew rest period before leaving the module, but Armstrong asked for this to be moved to earlier in the evening, Houston time . When he and Aldrin were ready to go outside, Eagle

1575-616: A couple of Pipers , which were kept at nearby Aretz Airport in Lafayette, Indiana . Flying the Aeronca to Wapakoneta in 1954, he damaged it in a rough landing in a farmer's field, and it had to be hauled back to Lafayette on a trailer. He was a baritone player in the Purdue All-American Marching Band . Ten years later he was made an honorary member of Kappa Kappa Psi national band honorary fraternity. Armstrong graduated with

1750-471: A density of one proton per four cubic meters. The density of the universe is clearly not uniform; it ranges from relatively high density in galaxies—including very high density in structures within galaxies, such as planets, stars, and black holes —to conditions in vast voids that have much lower density, at least in terms of visible matter. Unlike matter and dark matter, dark energy seems not to be concentrated in galaxies: although dark energy may account for

1925-658: A descendant of Clan Armstrong . He had a younger sister, June, and a younger brother, Dean. His father was an auditor for the Ohio state government , and the family moved around the state repeatedly, living in 16 towns over the next 14 years. Armstrong's love for flying grew during this time, having started at the age of two when his father took him to the Cleveland Air Races . When he was five or six, he experienced his first airplane flight in Warren, Ohio , when he and his father took

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2100-533: A fact she regretted later in life. The couple had three children. In June 1961, their daughter Karen was diagnosed with diffuse intrinsic pontine glioma , a malignant tumor of the middle part of her brain stem . X-ray treatment slowed its growth, but her health deteriorated to the point where she could no longer walk or talk. She died of pneumonia , related to her weakened health, on January 28, 1962, aged two. Following his graduation from Purdue, Armstrong became an experimental research test pilot. He applied at

2275-417: A first successful landing on the east side of the lake. Then Yeager told him to try again, this time a bit slower. On the second landing, they became stuck, provoking Yeager to fits of laughter. On May 21, 1962, Armstrong was involved in the "Nellis Affair". He was sent in an F-104 to inspect Delamar Dry Lake in southern Nevada, again for emergency landings. He misjudged his altitude and did not realize that

2450-488: A flight simulator expert with whom Armstrong had worked closely at Edwards, saw the late arrival of the application and slipped it into the pile before anyone noticed. At Brooks Air Force Base at the end of June, Armstrong underwent a medical exam that many of the applicants described as painful and at times seemingly pointless. NASA's Director of Flight Crew Operations, Deke Slayton , called Armstrong on September 13, 1962, and asked whether he would be interested in joining

2625-477: A good education without going all the way to Cambridge, Massachusetts . His college tuition was paid for under the Holloway Plan . Successful applicants committed to two years of study, followed by two years of flight training and one year of service as an aviator in the U.S. Navy , then completion of the final two years of their bachelor's degree . Armstrong did not take courses in naval science, nor did he join

2800-519: A hazard to astronauts, even in low Earth orbit. They create aurorae seen at high latitudes in an oval surrounding the geomagnetic poles . xGeo space is a concept used by the US to refer to space of high Earth orbits , ranging from beyond geosynchronous orbit (GEO) at approximately 35,786 km (22,236 mi), out to the L2 Earth-Moon Lagrange point at 448,900 km (278,934 mi). This

2975-507: A majority of the mass-energy in the universe, dark energy's influence is 5 orders of magnitude smaller than the influence of gravity from matter and dark matter within the Milky Way. Outer space is the closest known approximation to a perfect vacuum . It has effectively no friction , allowing stars, planets , and moons to move freely along their ideal orbits , following the initial formation stage. The deep vacuum of intergalactic space

3150-541: A maximum of 853. Though development of this aircraft began in 1988 as a competitor to the 747, the A380 made its first test flight in April 2005. Some of the elements of aerospace engineering are: The basis of most of these elements lies in theoretical physics , such as fluid dynamics for aerodynamics or the equations of motion for flight dynamics . There is also a large empirical component. Historically, this empirical component

3325-415: A meeting with Slayton. The first thing Slayton said was, "The guys who are going to fly the first lunar missions are the guys in this room." According to Cernan, only Armstrong showed no reaction to the statement. To Armstrong it came as no surprise—the room was full of veterans of Project Gemini, the only people who could fly the lunar missions. Slayton talked about the planned missions and named Armstrong to

3500-416: A no-radio approach. The loss of hydraulic fluid caused the tailhook to release, and upon landing, he caught the arresting wire attached to an anchor chain, and dragged the chain along the runway. It took thirty minutes to clear the runway and rig another arresting cable. Armstrong telephoned Edwards and asked for someone to collect him. Milt Thompson was sent in an F-104B, the only two-seater available, but

3675-573: A participant in the U.S. Air Force 's Man in Space Soonest and X-20 Dyna-Soar human spaceflight programs. Armstrong joined the NASA Astronaut Corps in the second group , which was selected in 1962. He made his first spaceflight as command pilot of Gemini 8 in March 1966, becoming NASA 's first civilian astronaut to fly in space. During this mission with pilot David Scott , he performed

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3850-502: A perigee as low as 80 to 90 km (50 to 56 mi), surviving for multiple orbits. At an altitude of 120 km (75 mi), descending spacecraft such as NASA 's Space Shuttle begin atmospheric entry (termed the Entry Interface), when atmospheric drag becomes noticeable, thus beginning the process of switching from steering with thrusters to maneuvering with aerodynamic control surfaces. The Kármán line , established by

4025-477: A plane Thompson had never flown. With great difficulty, Thompson made it to Nellis, where a strong crosswind caused a hard landing and the left main tire suffered a blowout. The runway was again closed to clear it, and Bill Dana was sent to Nellis in a T-33, but he almost landed long. The Nellis base operations office then decided that to avoid any further problems, it would be best to find the three NASA pilots ground transport back to Edwards. In June 1958, Armstrong

4200-520: A pole, which sliced off 2 feet (0.61 m) of the Panther's right wing. Further perversions of the story by different authors added that he was only 20 feet (6.1 m) from the ground and that 3 feet (0.91 m) of his wing was sheared off. Armstrong flew the plane back to friendly territory, but because of the loss of the aileron , ejection was his only safe option. He intended to eject over water and await rescue by Navy helicopters, but his parachute

4375-636: A practical boundary have been proposed, ranging from 30 km (19 mi) out to 1,600,000 km (990,000 mi). High-altitude aircraft , such as high-altitude balloons have reached altitudes above Earth of up to 50 km. Up until 2021, the United States designated people who travel above an altitude of 50 mi (80 km) as astronauts. Astronaut wings are now only awarded to spacecraft crew members that "demonstrated activities during flight that were essential to public safety, or contributed to human space flight safety." In 2009, measurements of

4550-548: A proposed two-man spacecraft. This time, selection was open to qualified civilian test pilots. Armstrong visited the Seattle World's Fair in May 1962 and attended a conference there on space exploration that was co-sponsored by NASA. After he returned from Seattle on June 4, he applied to become an astronaut. His application arrived about a week past the June 1, 1962, deadline, but Dick Day,

4725-590: A ride in a Ford Trimotor (also known as the "Tin Goose"). The family's last move was in 1944 and took them back to Wapakoneta, where Armstrong attended Blume High School and took flying lessons at the Wapakoneta airfield. He earned a student flight certificate on his 16th birthday, then soloed in August, all before he had a driver's license. He was an active Boy Scout and earned the rank of Eagle Scout . As an adult, he

4900-481: A simulated Martian environment. The lithopanspermia hypothesis suggests that rocks ejected into outer space from life-harboring planets may successfully transport life forms to another habitable world. A conjecture is that just such a scenario occurred early in the history of the Solar System, with potentially microorganism -bearing rocks being exchanged between Venus, Earth, and Mars. The lack of pressure in space

5075-643: A spacecraft; similarly, " space-based " means based in outer space or on a planet or moon. The size of the whole universe is unknown, and it might be infinite in extent. According to the Big Bang theory, the very early universe was an extremely hot and dense state about 13.8 billion years ago which rapidly expanded . About 380,000 years later the universe had cooled sufficiently to allow protons and electrons to combine and form hydrogen—the so-called recombination epoch . When this happened, matter and energy became decoupled, allowing photons to travel freely through

5250-469: Is a continuous stream of charged particles emanating from the Sun which creates a very tenuous atmosphere (the heliosphere ) for billions of kilometers into space. This wind has a particle density of 5–10 protons /cm and is moving at a velocity of 350–400 km/s (780,000–890,000 mph). Interplanetary space extends out to the heliopause where the influence of the galactic environment starts to dominate over

5425-492: Is about 11,200 m/s (40,300 km/h; 25,100 mph). Orbiting spacecraft with a perigee below about 2,000 km (1,200 mi) are subject to drag from the Earth's atmosphere, which decreases the orbital altitude. The rate of orbital decay depends on the satellite's cross-sectional area and mass, as well as variations in the air density of the upper atmosphere. At altitudes above 800 km (500 mi), orbital lifetime

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5600-501: Is about five times the Moon's orbital distance , but which distance is also far less than the distance between Earth and any adjacent planet. Interplanetary space within the Solar System is the space between the eight planets, the space between the planets and the Sun, as well as that space beyond the orbit of the outermost planet Neptune where the solar wind remains active. The solar wind

5775-457: Is co-populated by groups of co-orbital Near-Earth Objects (NEOs), such as horseshoe librators and Earth trojans , with some NEOs at times becoming temporary satellites and quasi-moons to Earth. Deep space is defined by the United States government as all of outer space which lies further from Earth than a typical low-Earth-orbit, thus assigning the Moon to deep-space. Other definitions vary

5950-529: Is conventionally used as the start of outer space in space treaties and for aerospace records keeping. Certain portions of the upper stratosphere and the mesosphere are sometimes referred to as "near space". The framework for international space law was established by the Outer Space Treaty , which entered into force on 10 October 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space . Despite

6125-496: Is divided into overlapping regions of space. Near-Earth space is the region of space extending from low Earth orbits out to geostationary orbits . This region includes the major orbits for artificial satellites and is the site of most of humanity's space activity. The region has seen high levels of space debris, sometimes dubbed space pollution , threatening any space activity in this region. Some of this debris re-enters Earth's atmosphere periodically. Although it meets

6300-438: Is free for all nation states to explore and is not subject to claims of national sovereignty, calling outer space the "province of all mankind". This status as a common heritage of mankind has been used, though not without opposition, to enforce the right to access and shared use of outer space for all nations equally, particularly non-spacefaring nations. It prohibits the deployment of nuclear weapons in outer space. The treaty

6475-487: Is located beyond the orbit of the Moon and therefore includes cislunar space. Translunar space is the region of lunar transfer orbits , between the Moon and Earth. Cislunar space is a region outside of Earth that includes lunar orbits , the Moon's orbital space around Earth and the Lagrange points . The region where a body's gravitational potential remains dominant against gravitational potentials from other bodies,

6650-475: Is measured in centuries. Below about 300 km (190 mi), decay becomes more rapid with lifetimes measured in days. Once a satellite descends to 180 km (110 mi), it has only hours before it vaporizes in the atmosphere. Space in proximity to the Earth is physically similar to the remainder of interplanetary space, but is home to a multitude of Earth–orbiting satellites and has been subject to extensive studies. For identification purposes, this volume

6825-422: Is measured in terms of the kinetic activity of the gas, as it is on Earth. The radiation of outer space has a different temperature than the kinetic temperature of the gas, meaning that the gas and radiation are not in thermodynamic equilibrium . All of the observable universe is filled with photons that were created during the Big Bang, which is known as the cosmic microwave background radiation (CMB). (There

7000-449: Is not devoid of matter , as it contains a few hydrogen atoms per cubic meter. By comparison, the air humans breathe contains about 10 molecules per cubic meter. The low density of matter in outer space means that electromagnetic radiation can travel great distances without being scattered: the mean free path of a photon in intergalactic space is about 10  km, or 10 billion light years. In spite of this, extinction , which

7175-551: Is quite likely a correspondingly large number of neutrinos called the cosmic neutrino background . ) The current black body temperature of the background radiation is about 2.7 K (−455 °F). The gas temperatures in outer space can vary widely. For example, the temperature in the Boomerang Nebula is 1 K (−458 °F), while the solar corona reaches temperatures over 1,200,000–2,600,000 K (2,200,000–4,700,000 °F). Magnetic fields have been detected in

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7350-631: Is slowed by the pressure containment of blood vessels, so some blood remains liquid. Swelling and ebullism can be reduced by containment in a pressure suit . The Crew Altitude Protection Suit (CAPS), a fitted elastic garment designed in the 1960s for astronauts, prevents ebullism at pressures as low as 2 kilopascals (0.3 psi). Supplemental oxygen is needed at 8 km (5 mi) to provide enough oxygen for breathing and to prevent water loss, while above 20 km (12 mi) pressure suits are essential to prevent ebullism. Most space suits use around 30–39 kilopascals (4–6 psi) of pure oxygen, about

7525-538: Is the absorption and scattering of photons by dust and gas, is an important factor in galactic and intergalactic astronomy . Stars, planets, and moons retain their atmospheres by gravitational attraction. Atmospheres have no clearly delineated upper boundary: the density of atmospheric gas gradually decreases with distance from the object until it becomes indistinguishable from outer space. The Earth's atmospheric pressure drops to about 0.032 Pa at 100 kilometres (62 miles) of altitude, compared to 100,000 Pa for

7700-447: Is the body's sphere of influence or gravity well, mostly described with the Hill sphere model. In the case of Earth this includes all space from the Earth to a distance of roughly 1% of the mean distance from Earth to the Sun, or 1.5 million km (0.93 million mi). Beyond Earth's Hill sphere extends along Earth's orbital path its orbital and co-orbital space. This space

7875-415: Is the expanse that exists beyond Earth's atmosphere and between celestial bodies . It contains ultra-low levels of particle densities , constituting a near-perfect vacuum of predominantly hydrogen and helium plasma , permeated by electromagnetic radiation , cosmic rays , neutrinos , magnetic fields and dust . The baseline temperature of outer space, as set by the background radiation from

8050-504: Is the most immediate dangerous characteristic of space to humans. Pressure decreases above Earth, reaching a level at an altitude of around 19.14 km (11.89 mi) that matches the vapor pressure of water at the temperature of the human body . This pressure level is called the Armstrong line , named after American physician Harry G. Armstrong . At or above the Armstrong line, fluids in

8225-761: The Air Medal for 20 combat missions, two gold stars for the next 40, the Korean Service Medal and Engagement Star, the National Defense Service Medal , and the United Nations Korea Medal . Armstrong's regular commission was terminated on February 25, 1952, and he became an ensign in the United States Navy Reserve . On completion of his combat tour with Essex , he was assigned to a transport squadron, VR-32, in May 1952. He

8400-554: The Andromeda Galaxy was first measured. Humans began the physical exploration of space later in the same century with the advent of high-altitude balloon flights . This was followed by crewed rocket flights and, then, crewed Earth orbit, first achieved by Yuri Gagarin of the Soviet Union in 1961. The economic cost of putting objects, including humans, into space is very high, limiting human spaceflight to low Earth orbit and

8575-605: The Antonov An-225 Mriya cargo aircraft commenced its first flight. It holds the records for the world's heaviest aircraft, heaviest airlifted cargo, and longest airlifted cargo of any aircraft in operational service. On October 25, 2007, the Airbus A380 made its maiden commercial flight from Singapore to Sydney, Australia. This aircraft was the first passenger plane to surpass the Boeing 747 in terms of passenger capacity, with

8750-476: The Big Bang , is 2.7 kelvins (−270 °C; −455 °F). The plasma between galaxies is thought to account for about half of the baryonic (ordinary) matter in the universe, having a number density of less than one hydrogen atom per cubic metre and a kinetic temperature of millions of kelvins . Local concentrations of matter have condensed into stars and galaxies . Intergalactic space takes up most of

8925-548: The Boeing 747 made its first commercial flight from New York to London. This aircraft made history and became known as the "Jumbo Jet" or "Whale" due to its ability to hold up to 480 passengers. Another significant development came in 1976, with the development of the first passenger supersonic aircraft, the Concorde . The development of this aircraft was agreed upon by the French and British on November 29, 1962. On December 21, 1988,

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9100-467: The Bogotá Declaration , they claimed control of the segment of the geosynchronous orbital path corresponding to each country. These claims are not internationally accepted. An increasing issue of international space law and regulation has been the dangers of the growing number of space debris . A spacecraft enters orbit when its centripetal acceleration due to gravity is less than or equal to

9275-697: The Congressional Space Medal of Honor in 1978, he was inducted into the National Aviation Hall of Fame in 1979, and with his former crewmates received the Congressional Gold Medal in 2009. After he resigned from NASA in 1971, Armstrong taught in the Department of Aerospace Engineering at the University of Cincinnati until 1979. He served on the Apollo 13 accident investigation and on

9450-629: The Convair F-106 Delta Dart . He also flew the Douglas DC-3 , Lockheed T-33 Shooting Star , North American F-86 Sabre , McDonnell Douglas F-4 Phantom II , Douglas F5D-1 Skylancer , Boeing B-29 Superfortress, Boeing B-47 Stratojet and Boeing KC-135 Stratotanker , and was one of eight elite pilots involved in the Parasev paraglider research vehicle program. Over his career, he flew more than 200 different models of aircraft. His first flight in

9625-571: The Curtiss JN 4 , Farman F.60 Goliath , and Fokker Trimotor . Notable military airplanes of this period include the Mitsubishi A6M Zero , Supermarine Spitfire and Messerschmitt Bf 109 from Japan, United Kingdom, and Germany respectively. A significant development came with the first operational Jet engine -powered airplane, the Messerschmitt Me 262 which entered service in 1944 towards

9800-549: The Fédération Aéronautique Internationale , and used internationally by the United Nations , is set at an altitude of 100 km (62 mi) as a working definition for the boundary between aeronautics and astronautics. This line is named after Theodore von Kármán , who argued for an altitude where a vehicle would have to travel faster than orbital velocity to derive sufficient aerodynamic lift from

9975-585: The Grumman F9F Panther from the aircraft carrier USS  Essex . After the war, he completed his bachelor's degree at Purdue and became a test pilot at the National Advisory Committee for Aeronautics (NACA) High-Speed Flight Station at Edwards Air Force Base in California. He was the project pilot on Century Series fighters and flew the North American X-15 seven times. He was also

10150-551: The International Union of Pure and Applied Chemistry (IUPAC) definition of standard pressure . Above this altitude, isotropic gas pressure rapidly becomes insignificant when compared to radiation pressure from the Sun and the dynamic pressure of the solar wind . The thermosphere in this range has large gradients of pressure, temperature and composition, and varies greatly due to space weather . The temperature of outer space

10325-530: The Kennedy Space Center on July 16, 1969, at 13:32:00 UTC (09:32:00 EDT local time). Armstrong's wife Janet and two sons watched from a yacht moored on the Banana River . During the launch, Armstrong's heart rate peaked at 110   beats per minute. He found the first stage the loudest, much noisier than the Gemini   8 Titan II launch. The Apollo command module was relatively roomy compared with

10500-530: The Manned Spacecraft Center (MSC) in Houston. The mission was generally successful, despite a problem with the fuel cells that prevented a rendezvous. Cooper and Conrad practiced a "phantom rendezvous", carrying out the maneuver without a target. The crews for Gemini   8 were assigned on September 20, 1965. Under the normal rotation system, the backup crew for one mission became the prime crew for

10675-443: The Moon . On the other hand, uncrewed spacecraft have reached all of the known planets in the Solar System . Outer space represents a challenging environment for human exploration because of the hazards of vacuum and radiation . Microgravity has a negative effect on human physiology that causes both muscle atrophy and bone loss . The use of the short version space , as meaning 'the region beyond Earth's sky', predates

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10850-491: The NASA Astronaut Corps as part of what the press dubbed "the New Nine "; without hesitation, Armstrong said yes. The selections were kept secret until three days later, although newspaper reports had circulated since earlier that year that he would be selected as the "first civilian astronaut". Armstrong was one of two civilian pilots selected for this group; the other was Elliot See , another former naval aviator. NASA selected

11025-698: The National Advisory Committee for Aeronautics (NACA) High-Speed Flight Station at Edwards Air Force Base. NACA had no open positions, and forwarded his application to the Lewis Flight Propulsion Laboratory in Cleveland , where Armstrong made his first test flight on March 1, 1955. Armstrong's stint at Cleveland lasted only a couple of months before a position at the High-Speed Flight Station became available, and he reported for work there on July 11, 1955. On his first day, Armstrong

11200-742: The Naval Reserve Officers Training Corps . Armstrong's call-up from the Navy arrived on January 26, 1949, requiring him to report to Naval Air Station Pensacola in Florida for flight training with class 5-49. After passing the medical examinations, he became a midshipman on February 24, 1949. Flight training was conducted in a North American SNJ trainer , in which he soloed on September 9, 1949. On March 2, 1950, he made his first aircraft carrier landing on USS  Cabot , an achievement he considered comparable to his first solo flight. He

11375-524: The Rogers Commission , which investigated the Space Shuttle Challenger disaster . In 2012, Armstrong died because of complications resulting from coronary bypass surgery , at the age of 82. Armstrong was born near Wapakoneta, Ohio , on August 5, 1930, the son of Viola Louise (née Engel) and Stephen Koenig Armstrong. He was of German, English, Scots-Irish, and Scottish descent. He is

11550-410: The centrifugal acceleration due to the horizontal component of its velocity. For a low Earth orbit , this velocity is about 7,800 m/s (28,100 km/h; 17,400 mph); by contrast, the fastest piloted airplane speed ever achieved (excluding speeds achieved by deorbiting spacecraft) was 2,200 m/s (7,900 km/h; 4,900 mph) in 1967 by the North American X-15 . To achieve an orbit,

11725-500: The cosmic microwave background using satellites like the Wilkinson Microwave Anisotropy Probe . These observations indicate that the spatial geometry of the observable universe is " flat ", meaning that photons on parallel paths at one point remain parallel as they travel through space to the limit of the observable universe, except for local gravity. The flat universe, combined with the measured mass density of

11900-580: The first American satellite on January 31, 1958. The National Aeronautics and Space Administration was founded in 1958 after the Sputnik crisis . In 1969, Apollo 11 , the first human space mission to the Moon , took place. It saw three astronauts enter orbit around the Moon, with two, Neil Armstrong and Buzz Aldrin , visiting the lunar surface. The third astronaut, Michael Collins , stayed in orbit to rendezvous with Armstrong and Aldrin after their visit. An important innovation came on January 30, 1970, when

12075-523: The first person to walk on the Moon . He was also a naval aviator , test pilot , and university professor. Armstrong was born and raised in Wapakoneta, Ohio . He entered Purdue University , studying aeronautical engineering , with the U.S. Navy paying his tuition under the Holloway Plan . He became a midshipman in 1949 and a naval aviator the following year. He saw action in the Korean War , flying

12250-467: The immune system . Lesser symptoms include loss of body mass, nasal congestion, sleep disturbance, and puffiness of the face. During long-duration space travel, radiation can pose an acute health hazard . Exposure to high-energy, ionizing cosmic rays can result in fatigue, nausea, vomiting, as well as damage to the immune system and changes to the white blood cell count. Over longer durations, symptoms include an increased risk of cancer, plus damage to

12425-426: The zodiacal light . Interplanetary space contains the magnetic field generated by the Sun. There are magnetospheres generated by planets such as Jupiter, Saturn, Mercury and the Earth that have their own magnetic fields. These are shaped by the influence of the solar wind into the approximation of a teardrop shape, with the long tail extending outward behind the planet. These magnetic fields can trap particles from

12600-482: The "a" was inaudible due to the limitations of communications technology of the time. Ford and James R. Hansen , Armstrong's authorized biographer, presented these findings to Armstrong and NASA representatives, who conducted their own analysis. Armstrong found Ford's analysis "persuasive." Linguists David Beaver and Mark Liberman wrote of their skepticism of Ford's claims on the blog Language Log . A 2016 peer-reviewed study again concluded Armstrong had included

12775-526: The B-29 could not land with the Skyrocket attached to its belly. Armstrong and Butchart brought the aircraft into a nose-down attitude to increase speed, then launched the Skyrocket. At the instant of launch, the number-four engine propeller disintegrated. Pieces of it damaged the number-three engine and hit the number-two engine. Butchart and Armstrong were forced to shut down the damaged number-three engine, along with

12950-421: The Earth's magnetosphere and the solar wind. The inner boundary is the ionosphere . The variable space-weather conditions of geospace are affected by the behavior of the Sun and the solar wind; the subject of geospace is interlinked with heliophysics —the study of the Sun and its impact on the planets of the Solar System. The day-side magnetopause is compressed by solar-wind pressure—the subsolar distance from

13125-450: The Gemini spacecraft. None of the Apollo 11 crew suffered space sickness , as some members of previous crews had. Armstrong was especially glad about this, as he had been prone to motion sickness as a child and could experience nausea after long periods of aerobatics . Apollo 11's objective was to land safely on the Moon, rather than to touch down at a precise location. Three minutes into

13300-524: The Georgetown Inn, where they each found messages to phone the MSC. During these calls, they learned of the deaths of Gus Grissom , Ed White and Roger Chaffee in the fire. Armstrong and the group spent the rest of the night drinking scotch and discussing what had happened. On April 5, 1967, the same day the Apollo   1 investigation released its final report, Armstrong and 17 other astronauts gathered for

13475-540: The LLRV began rolling . He ejected safely before the vehicle struck the ground and burst into flames. Later analysis suggested that if he had ejected half a second later, his parachute would not have opened in time. His only injury was from biting his tongue. The LLRV was completely destroyed. Even though he was nearly killed, Armstrong maintained that without the LLRV and LLTV, the lunar landings would not have been successful, as they gave commanders essential experience in piloting

13650-472: The LM on its descent, NASA commissioned Bell Aircraft to build two Lunar Landing Research Vehicles (LLRV), later augmented with three Lunar Landing Training Vehicles (LLTV). Nicknamed the "Flying Bedsteads", they simulated the Moon's one-sixth gravity using a turbofan engine to support five-sixths of the craft's weight. On May 6, 1968, 100 feet (30 m) above the ground, Armstrong's controls started to degrade and

13825-537: The MH-96 control system when he flew to a height of over 207,000 feet (63 km) (the highest he flew before Gemini 8 ). He held up the aircraft nose during its descent to demonstrate the MH-96's g-limiting performance, and the X-15 ballooned back up to around 140,000 feet (43 km). He flew past the landing field at Mach   3 at over 100,000 feet (30 km) in altitude, and ended up 40 miles (64 km) south of Edwards. After sufficient descent, he turned back toward

14000-535: The Moon is unclear. Armstrong prepared his famous epigram on his own. In a post-flight press conference, he said that he chose the words "just prior to leaving the LM." In a 1983 interview in Esquire magazine, he explained to George Plimpton : "I always knew there was a good chance of being able to return to Earth, but I thought the chances of a successful touch down on the moon surface were about even money—fifty–fifty   ... Most people don't realize how difficult

14175-493: The Moon. According to Armstrong's 2005 biography, Slayton told him that although the planned crew was Commander Armstrong, Lunar Module Pilot Buzz Aldrin, and Command Module Pilot Michael Collins, he was offering Armstrong the chance to replace Aldrin with Jim Lovell. After thinking it over for a day, Armstrong told Slayton he would stick with Aldrin, as he had no difficulty working with him and thought Lovell deserved his own command. Replacing Aldrin with Lovell would have made Lovell

14350-598: The National Advisory Committee for Aeronautics, or NACA. It was the first government-sponsored organization to support aviation research. Though intended as an advisory board upon inception, the Langley Aeronautical Laboratory became its first sponsored research and testing facility in 1920. Between World Wars I and II, great leaps were made in the field, accelerated by the advent of mainstream civil aviation. Notable airplanes of this era include

14525-460: The Navy, Armstrong returned to Purdue. His previously earned good but not outstanding grades now improved, lifting his final Grade Point Average (GPA) to a respectable but not outstanding 4.8 out of 6.0. He pledged the Phi Delta Theta fraternity , and lived in its fraternity house. He wrote and co-directed two musicals as part of the all-student revue. The first was a version of Snow White and

14700-532: The OAMS. Mission rules dictated that once this system was turned on, the spacecraft had to reenter at the next possible opportunity. It was later thought that damaged wiring caused one of the thrusters to stick in the on position. A few people in the Astronaut Office, including Walter Cunningham , felt that Armstrong and Scott "had botched their first mission". There was speculation that Armstrong could have salvaged

14875-601: The Seven Dwarfs , co-directed with his girlfriend Joanne Alford from the Alpha Chi Omega sorority, with songs from the 1937 Walt Disney film , including " Someday My Prince Will Come "; the second was titled The Land of Egelloc ("college" spelled backward), with music from Gilbert and Sullivan but new lyrics. Armstrong was chairman of the Purdue Aero Flying Club, and flew the club's aircraft, an Aeronca and

15050-452: The Sun. It is the space between the stars or stellar systems within a nebula or galaxy. Interstellar space contains an interstellar medium of sparse matter and radiation. The boundary between an astrosphere and interstellar space is known as an astropause . For the Sun, the astrosphere and astropause are called the heliosphere and heliopause. Approximately 70% of the mass of the interstellar medium consists of lone hydrogen atoms; most of

15225-406: The aerospace industry. A background in chemistry, physics, computer science and mathematics is important for students pursuing an aerospace engineering degree. The term " rocket scientist " is sometimes used to describe a person of great intelligence since rocket science is seen as a practice requiring great mental ability, especially technically and mathematically. The term is used ironically in

15400-406: The alarms were not a concern; the 1202 and 1201 alarms were caused by executive overflows in the lunar module guidance computer . In 2007, Aldrin said the overflows were caused by his own counter-checklist choice of leaving the docking radar on during the landing process, causing the computer to process unnecessary radar data. When it did not have enough time to execute all tasks, the computer dropped

15575-732: The atmosphere to support itself, which he calculated to be at an altitude of about 83.8 km (52.1 mi). This distinguishes altitudes below as the region of aerodynamics and airspace , and above as the space of astronautics and free space . There is no internationally recognized legal altitude limit on national airspace, although the Kármán line is the most frequently used for this purpose. Objections have been made to setting this limit too high, as it could inhibit space activities due to concerns about airspace violations. It has been argued for setting no specified singular altitude in international law, instead applying different limits depending on

15750-453: The aviation pioneers around the late 19th to early 20th centuries, although the work of Sir George Cayley dates from the last decade of the 18th to the mid-19th century. One of the most important people in the history of aeronautics and a pioneer in aeronautical engineering, Cayley is credited as the first person to separate the forces of lift and drag , which affect any atmospheric flight vehicle. Early knowledge of aeronautical engineering

15925-420: The backup crew for Apollo 9 , which at that stage was planned as a medium Earth orbit test of the combined lunar module and command and service module . The crew was officially assigned on November 20, 1967. For crewmates, Armstrong was assigned Lovell and Aldrin, from Gemini 12. After design and manufacturing delays of the lunar module (LM), Apollo 8 and   9 swapped prime and backup crews. Based on

16100-430: The backup crew of Tom Stafford and Gene Cernan , while Jim Lovell and Buzz Aldrin moved up from the backup crew of Gemini 10 to become the backup for Gemini 9, and would eventually fly Gemini 12 . Gemini 8 launched on March 16, 1966. It was the most complex mission yet, with a rendezvous and docking with an uncrewed Agena target vehicle , and the planned second American spacewalk ( EVA ) by Scott. The mission

16275-498: The blood empties into the lungs to try to equalize the partial pressure gradient. Once the deoxygenated blood arrives at the brain, humans lose consciousness after a few seconds and die of hypoxia within minutes. Blood and other body fluids boil when the pressure drops below 6.3 kilopascals (1 psi), and this condition is called ebullism . The steam may bloat the body to twice its normal size and slow circulation, but tissues are elastic and porous enough to prevent rupture. Ebullism

16450-399: The body adjusts to the new environment. Longer-term exposure to weightlessness results in muscle atrophy and deterioration of the skeleton, or spaceflight osteopenia . These effects can be minimized through a regimen of exercise. Other effects include fluid redistribution, slowing of the cardiovascular system , decreased production of red blood cells , balance disorders, and a weakening of

16625-500: The case, in particular based on the craft and its purpose. Spacecraft have flown over foreign countries as low as 30 km (19 mi), as in the example of the Space Shuttle. The Outer Space Treaty provides the basic framework for international space law. It covers the legal use of outer space by nation states, and includes in its definition of outer space , the Moon, and other celestial bodies. The treaty states that outer space

16800-414: The center of the Earth is typically 10 Earth radii. On the night side, the solar wind stretches the magnetosphere to form a magnetotail that sometimes extends out to more than 100–200 Earth radii. For roughly four days of each month, the lunar surface is shielded from the solar wind as the Moon passes through the magnetotail. Geospace is populated by electrically charged particles at very low densities,

16975-447: The continually expanding space. Matter that remained following the initial expansion has since undergone gravitational collapse to create stars, galaxies and other astronomical objects, leaving behind a deep vacuum that forms what is now called outer space. As light has a finite velocity, this theory constrains the size of the directly observable universe. The present day shape of the universe has been determined from measurements of

17150-406: The cosmic rays upon the shielding produces additional radiation that can affect the crew. Further research is needed to assess the radiation hazards and determine suitable countermeasures. The transition between Earth's atmosphere and outer space lacks a well-defined physical boundary, with the air pressure steadily decreasing with altitude until it mixes with the solar wind. Various definitions for

17325-694: The couple, there was no real courtship, and neither could remember the exact circumstances of their engagement. They were married on January 28, 1956, at the Congregational Church in Wilmette, Illinois . When he moved to Edwards Air Force Base , he lived in the bachelor quarters of the base, while Janet lived in the Westwood district of Los Angeles. After one semester, they moved into a house in Antelope Valley , near Edwards AFB. Janet did not finish her degree,

17500-450: The definition of outer space, the atmospheric density inside low-Earth orbital space, the first few hundred kilometers above the Kármán line, is still sufficient to produce significant drag on satellites. Geospace is a region of space that includes Earth's upper atmosphere and magnetosphere . The Van Allen radiation belts lie within the geospace. The outer boundary of geospace is the magnetopause , which forms an interface between

17675-410: The design of World War I military aircraft. In 1914, Robert Goddard was granted two U.S. patents for rockets using solid fuel, liquid fuel, multiple propellant charges, and multi-stage designs. This would set the stage for future applications in multi-stage propulsion systems for outer space. On March 3, 1915, the U.S. Congress established the first aeronautical research administration, known then as

17850-422: The direction and speed of ions in the atmosphere were made from a sounding rocket . The altitude of 118 km (73.3 mi) above Earth was the midpoint for charged particles transitioning from the gentle winds of the Earth's atmosphere to the more extreme flows of outer space. The latter can reach velocities well over 268 m/s (880 ft/s). Spacecraft have entered into a highly elliptical orbit with

18025-452: The drafting of UN resolutions for the peaceful uses of outer space, anti-satellite weapons have been tested in Earth orbit . The concept that the space between the Earth and the Moon must be a vacuum was first proposed in the 17th century after scientists discovered that air pressure decreased with altitude. The immense scale of outer space was grasped in the 20th century when the distance to

18200-577: The end of the Second World War. The first definition of aerospace engineering appeared in February 1958, considering the Earth's atmosphere and outer space as a single realm, thereby encompassing both aircraft ( aero ) and spacecraft ( space ) under the newly coined term aerospace . In response to the USSR launching the first satellite, Sputnik , into space on October 4, 1957, U.S. aerospace engineers launched

18375-591: The exploits of the Brazilian-born aviation pioneer Alberto Santos-Dumont . On January 27, 1967—the day of the Apollo 1 fire —Armstrong was in Washington, D.C., with Cooper, Gordon, Lovell and Scott Carpenter for the signing of the United Nations Outer Space Treaty . The astronauts chatted with the assembled dignitaries until 18:45, when Carpenter went to the airport, and the others returned to

18550-562: The expression "It's not rocket science" to indicate that a task is simple. Strictly speaking, the use of "science" in "rocket science" is a misnomer since science is about understanding the origins, nature, and behavior of the universe; engineering is about using scientific and engineering principles to solve problems and develop new technology. The more etymologically correct version of this phrase would be "rocket engineer". However, "science" and "engineering" are often misused as synonyms. Outer space Outer space (or simply space )

18725-436: The eyes, nervous system , lungs and the gastrointestinal tract . On a round-trip Mars mission lasting three years, a large fraction of the cells in an astronaut's body would be traversed and potentially damaged by high energy nuclei. The energy of such particles is significantly diminished by the shielding provided by the walls of a spacecraft and can be further diminished by water containers and other barriers. The impact of

18900-511: The first docking of two spacecraft ; the mission was aborted after Armstrong used some of his re-entry control fuel to stabilize a dangerous roll caused by a stuck thruster. During training for Armstrong's second and last spaceflight as commander of Apollo 11 , he had to eject from the Lunar Landing Research Vehicle moments before a crash. On July 20, 1969, Armstrong and Apollo 11 Lunar Module (LM) pilot Buzz Aldrin became

19075-403: The first American civilian in space. ( Valentina Tereshkova of the Soviet Union had become the first civilian—and first woman—nearly three years earlier aboard Vostok 6 when it launched on June 16, 1963. ) Armstrong would also be the last of his group to fly in space, as See died in a T-38 crash on February 28, 1966, that also took the life of crewmate Charles Bassett . They were replaced by

19250-520: The first flight of the MH-96 adaptive flight control system. He became an employee of the National Aeronautics and Space Administration (NASA) when it was established on October 1, 1958, absorbing NACA. Armstrong was involved in several incidents that went down in Edwards folklore or were chronicled in the memoirs of colleagues. During his sixth X-15 flight on April 20, 1962, Armstrong was testing

19425-576: The first people to land on the Moon , and the next day they spent two and a half hours outside the Lunar Module Eagle spacecraft while Michael Collins remained in lunar orbit in the Apollo Command Module Columbia . When Armstrong first stepped onto the lunar surface, he famously said: "That's one small step for [a] man, one giant leap for mankind." It was broadcast live to an estimated 530 million viewers worldwide. Apollo 11

19600-406: The first person on the Moon, in part because NASA management saw him as a person who did not have a large ego. A press conference on April 14, 1969, gave the design of the LM cabin as the reason for Armstrong's being first; the hatch opened inwards and to the right, making it difficult for the LM pilot, on the right-hand side, to exit first. At the time of their meeting, the four men did not know about

19775-487: The ground, the docked spacecraft began to roll, and Armstrong attempted to correct this with the Gemini's Orbit Attitude and Maneuvering System (OAMS). Following the earlier advice of Mission Control, they undocked, but the roll increased dramatically until they were turning about once per second, indicating a problem with Gemini's attitude control . Armstrong engaged the Reentry Control System (RCS) and turned off

19950-479: The harsh environment, several life forms have been found that can withstand extreme space conditions for extended periods. Species of lichen carried on the ESA BIOPAN facility survived exposure for ten days in 2007. Seeds of Arabidopsis thaliana and Nicotiana tabacum germinated after being exposed to space for 1.5 years. A strain of Bacillus subtilis has survived 559 days when exposed to low Earth orbit or

20125-526: The hatch consideration. The first knowledge of the meeting outside the small group came when Kraft wrote his book. Methods of circumventing this difficulty existed, but it is not known if these were considered at the time. Slayton added, "Secondly, just on a pure protocol basis, I figured the commander ought to be the first guy out   ... I changed it as soon as I found they had the time line that showed that. Bob Gilruth approved my decision." A Saturn V rocket launched Apollo 11 from Launch Complex 39A at

20300-596: The high energy range, the flux of electrons is only about 1% of that of protons. Cosmic rays can damage electronic components and pose a health threat to space travelers. Smells produced returning from low Earth orbit extravehicular activity have a burned/metallic odor, similar to the scent of arc welding fumes, resulting from oxygen in low Earth orbit around the ISS, which clings to suits and equipment. Other regions of space could have very different smells, like that of different alcohols in molecular clouds . Despite

20475-725: The integration of all components that constitute an aerospace vehicle (subsystems including power, aerospace bearings , communications, thermal control , life support system , etc.) and its life cycle (design, temperature, pressure, radiation , velocity , lifetime ). Aerospace engineering may be studied at the advanced diploma , bachelor's , master's , and Ph.D. levels in aerospace engineering departments at many universities, and in mechanical engineering departments at others. A few departments offer degrees in space-focused astronautical engineering. Some institutions differentiate between aeronautical and astronautical engineering. Graduate degrees are offered in advanced or specialty areas for

20650-610: The international co-operation in the peaceful uses of outer space and preventing an arms race in space. Four additional space law treaties have been negotiated and drafted by the UN's Committee on the Peaceful Uses of Outer Space . Still, there remains no legal prohibition against deploying conventional weapons in space, and anti-satellite weapons have been successfully tested by the USA, USSR, China, and in 2019, India. The 1979 Moon Treaty turned

20825-437: The interstellar medium, including the heavy elements previously formed within the star's core. The density of matter in the interstellar medium can vary considerably: the average is around 10 particles per m , but cold molecular clouds can hold 10 –10 per m . Neil Armstrong Neil Alden Armstrong (August 5, 1930 – August 25, 2012) was an American astronaut and aeronautical engineer who, in 1969, became

21000-588: The jurisdiction of all heavenly bodies (including the orbits around such bodies) over to the international community. The treaty has not been ratified by any nation that currently practices human spaceflight. In 1976, eight equatorial states (Ecuador, Colombia, Brazil, The Republic of the Congo, Zaire, Uganda, Kenya, and Indonesia) met in Bogotá, Colombia: with their "Declaration of the First Meeting of Equatorial Countries", or

21175-444: The landing area, and landed. It was the longest X-15 flight in both flight time and length of the ground track. Fellow astronaut Michael Collins wrote that of the X-15 pilots Armstrong "had been considered one of the weaker stick-and-rudder men, but the very best when it came to understanding the machine's design and how it operated". Many of the test pilots at Edwards praised Armstrong's engineering ability. Milt Thompson said he

21350-399: The landing gear had not fully extended. As he touched down, the landing gear began to retract; Armstrong applied full power to abort the landing, but the ventral fin and landing gear door struck the ground, damaging the radio and releasing hydraulic fluid . Without radio communication, Armstrong flew south to Nellis Air Force Base , past the control tower, and waggled his wings, the signal for

21525-442: The large pressure differential between inside and outside the chest. Even if the subject's airway is fully open, the flow of air through the windpipe may be too slow to prevent the rupture. Rapid decompression can rupture eardrums and sinuses, bruising and blood seep can occur in soft tissues, and shock can cause an increase in oxygen consumption that leads to hypoxia . As a consequence of rapid decompression, oxygen dissolved in

21700-486: The left-hand pilot seat flying the B-29. As they climbed to 30,000 feet (9 km), the number-four engine stopped and the propeller began windmilling (rotating freely) in the airstream. Hitting the switch that would stop the propeller's spinning, Butchart watched it slow, then resume spinning even faster than the others; if it spun too fast, it would break apart. Their aircraft needed to hold an airspeed of 210 mph (338 km/h) to launch its Skyrocket payload, and

21875-496: The lower-priority ones, triggering the alarms. Aldrin said he decided to leave the radar on in case an abort was necessary when re-docking with the Apollo command module; he did not realize it would cause the processing overflows. When Armstrong noticed they were heading toward a landing area that seemed unsafe, he took manual control of the LM and attempted to find a safer area. This took longer than expected, and longer than most simulations had taken. For this reason, Mission Control

22050-564: The lunar descent, Armstrong noted that craters were passing about two seconds too early, which meant the Lunar Module Eagle would probably touch down several miles (kilometres) beyond the planned landing zone. As the Eagle ' s landing radar acquired the surface, several computer error alarms sounded. The first was a code 1202 alarm, and even with their extensive training, neither Armstrong nor Aldrin knew what this code meant. They promptly received word from CAPCOM Charles Duke in Houston that

22225-466: The lunar landing craft. In addition to the LLRV training, NASA began lunar landing simulator training after Apollo 10 was completed. Aldrin and Armstrong trained for a variety of scenarios that could develop during a real lunar landing. They also received briefings from geologists at NASA. After Armstrong served as backup commander for Apollo   8, Slayton offered him the post of commander of Apollo 11 on December 23, 1968, as Apollo   8 orbited

22400-471: The lunar module pilot, unofficially the lowest ranked member, and Armstrong could not justify placing Lovell, the commander of Gemini 12, in the number   3 position of the crew. The crew of Apollo 11 was assigned on January 9, 1969, as Armstrong, Collins, and Aldrin, with Lovell, Anders, and Fred Haise as the backup crew. According to Chris Kraft , a March 1969 meeting among Slayton, George Low, Bob Gilruth , and Kraft determined that Armstrong would be

22575-404: The magnetic field and particle flux from the Sun. The distance and strength of the heliopause varies depending on the activity level of the solar wind. The heliopause in turn deflects away low-energy galactic cosmic rays, with this modulation effect peaking during solar maximum. The volume of interplanetary space is a nearly total vacuum, with a mean free path of about one astronomical unit at

22750-529: The mission if he had turned on only one of the two RCS rings, saving the other for mission objectives. These criticisms were unfounded; no malfunction procedures had been written, and it was possible to turn on only both RCS rings, not one or the other. Gene Kranz wrote, "The crew reacted as they were trained, and they reacted wrong because we trained them wrong." The mission planners and controllers had failed to realize that when two spacecraft were docked, they must be considered one spacecraft. Kranz considered this

22925-537: The mission objectives, while Armstrong served as a capsule communicator (CAPCOM). Following the flight, President Lyndon B. Johnson asked Armstrong and his wife to take part in a 24-day goodwill tour of South America. Also on the tour, which took in 11   countries and 14   major cities, were Dick Gordon, George Low , their wives, and other government officials. In Paraguay, Armstrong greeted dignitaries in their local language, Guarani ; in Brazil he talked about

23100-399: The mission was. So it didn't seem to me there was much point in thinking of something to say if we'd have to abort landing." In 2012, his brother Dean Armstrong said that Neil showed him a draft of the line months before the launch. Historian Andrew Chaikin , who interviewed Armstrong in 1988 for his book A Man on the Moon , disputed that Armstrong claimed to have conceived the line during

23275-623: The mission's most important lesson. Armstrong was depressed that the mission was cut short, canceling most mission objectives and robbing Scott of his EVA. The Agena was later reused as a docking target by Gemini 10. Armstrong and Scott received the NASA Exceptional Service Medal , and the Air Force awarded Scott the Distinguished Flying Cross as well. Scott was promoted to lieutenant colonel , and Armstrong received

23450-422: The mission. Recordings of Armstrong's transmission do not provide evidence for the indefinite article "a" before "man", though NASA and Armstrong insisted for years that static obscured it. Armstrong stated he would never make such a mistake, but after repeated listenings to recordings, he eventually conceded he must have dropped the "a". He later said he "would hope that history would grant me leeway for dropping

23625-518: The most distant high-z sources, indicating the presence of magnetic fields. Outside a protective atmosphere and magnetic field, there are few obstacles to the passage through space of energetic subatomic particles known as cosmic rays. These particles have energies ranging from about 10   eV up to an extreme 10  eV of ultra-high-energy cosmic rays . The peak flux of cosmic rays occurs at energies of about 10  eV, with approximately 87% protons, 12% helium nuclei and 1% heavier nuclei. In

23800-525: The motions of which are controlled by the Earth's magnetic field . These plasmas form a medium from which storm-like disturbances powered by the solar wind can drive electrical currents into the Earth's upper atmosphere. Geomagnetic storms can disturb two regions of geospace, the radiation belts and the ionosphere. These storms increase fluxes of energetic electrons that can permanently damage satellite electronics, interfering with shortwave radio communication and GPS location and timing. Magnetic storms can be

23975-414: The normal crew rotation, Armstrong would command Apollo 11, with one change: Collins on the Apollo   8 crew began experiencing trouble with his legs. Doctors diagnosed the problem as a bony growth between his fifth and sixth vertebrae, requiring surgery. Lovell took his place on the Apollo   8 crew, and, when Collins recovered, he joined Armstrong's crew. To give the astronauts practice piloting

24150-689: The number-one engine, because of the torque it created. They made a slow, circling descent from 30,000 ft (9 km) using only the number-two engine, and landed safely. Armstrong served as project pilot on Century Series fighters, including the North American F-100 Super Sabre A and C variants, the McDonnell F-101 Voodoo , the Lockheed F-104 Starfighter , the Republic F-105 Thunderchief and

24325-403: The orbital distance of the Earth. This space is not completely empty, and is sparsely filled with cosmic rays, which include ionized atomic nuclei and various subatomic particles. There is gas, plasma and dust, small meteors , and several dozen types of organic molecules discovered to date by microwave spectroscopy . A cloud of interplanetary dust is visible at night as a faint band called

24500-498: The products of various technological and engineering disciplines including aerodynamics , air propulsion , avionics , materials science , structural analysis and manufacturing . The interaction between these technologies is known as aerospace engineering. Because of the complexity and number of disciplines involved, aerospace engineering is carried out by teams of engineers, each having their own specialized area of expertise. The origin of aerospace engineering can be traced back to

24675-545: The reason why some pilot-engineers got into trouble: Their flying skills did not come naturally. Armstrong made seven flights in the X-15 between November 30, 1960, and July 26, 1962. He reached a top speed of Mach 5.74 (3,989 mph, 6,420 km/h) in the X-15-1, and left the Flight Research Center with a total of 2,400 flying hours. On April 24, 1962, Armstrong flew for the only time with Yeager. Their job, flying

24850-439: The remainder consists of helium atoms. This is enriched with trace amounts of heavier atoms formed through stellar nucleosynthesis . These atoms are ejected into the interstellar medium by stellar winds or when evolved stars begin to shed their outer envelopes such as during the formation of a planetary nebula . The cataclysmic explosion of a supernova propagates shock waves of stellar ejecta outward, distributing it throughout

25025-640: The same as the partial pressure of oxygen at the Earth's surface. This pressure is high enough to prevent ebullism, but evaporation of nitrogen dissolved in the blood could still cause decompression sickness and gas embolisms if not managed. Humans evolved for life in Earth gravity , and exposure to weightlessness has been shown to have deleterious effects on human health. Initially, more than 50% of astronauts experience space motion sickness . This can cause nausea and vomiting, vertigo , headaches, lethargy , and overall malaise. The duration of space sickness varies, but it typically lasts for 1–3 days, after which

25200-551: The second group that, compared with the Mercury Seven astronauts, were younger, and had more impressive academic credentials. Collins wrote that Armstrong was by far the most experienced test pilot in the Astronaut Corps. On February 8, 1965, Armstrong and Elliot See were picked as the backup crew for Gemini 5 , with Armstrong as commander, supporting the prime crew of Gordon Cooper and Pete Conrad . The mission's purpose

25375-451: The ship at the end of July. On August 29, 1951, Armstrong saw action in the Korean War as an escort for a photo reconnaissance plane over Songjin . Five days later, on September 3, he flew armed reconnaissance over the primary transportation and storage facilities south of the village of Majon-ni, west of Wonsan . According to Armstrong, he was making a low bombing run at 350 mph (560 km/h) when 6 feet (1.8 m) of his wing

25550-468: The solar wind and other sources, creating belts of charged particles such as the Van Allen radiation belts. Planets without magnetic fields, such as Mars, have their atmospheres gradually eroded by the solar wind. Interstellar space is the physical space outside of the bubbles of plasma known as astrospheres , formed by stellar winds originating from individual stars, or formed by solar wind emanating from

25725-625: The space around just about every class of celestial object. Star formation in spiral galaxies can generate small-scale dynamos , creating turbulent magnetic field strengths of around 5–10 μ G . The Davis–Greenstein effect causes elongated dust grains to align themselves with a galaxy's magnetic field, resulting in weak optical polarization . This has been used to show ordered magnetic fields that exist in several nearby galaxies. Magneto-hydrodynamic processes in active elliptical galaxies produce their characteristic jets and radio lobes . Non-thermal radio sources have been detected even among

25900-409: The starting point of deep-space from, "That which lies beyond the orbit of the moon," to "That which lies beyond the farthest reaches of the Solar System itself." The International Telecommunication Union responsible for radio communication , including with satellites, defines deep-space as, "distances from the Earth equal to, or greater than, 2 million km (1.2 million mi)," which

26075-465: The surface of the Moon occurred several seconds after 20:17:40 UTC on July 20, 1969. One of three 67-inch (170 cm) probes attached to three of the LM's four legs made contact with the surface, a panel light in the LM illuminated, and Aldrin called out, "Contact light." Armstrong shut the engine off and said, "Shutdown." As the LM settled onto the surface, Aldrin said, "Okay, engine stop"; then they both called out some post-landing checklist items. After

26250-400: The syllable and understand that it was certainly intended, even if it was not said—although it might actually have been". There have since been claims and counter-claims about whether acoustic analysis of the recording reveals the presence of the missing "a"; Peter Shann Ford , an Australian computer programmer, conducted a digital audio analysis and claims that Armstrong did say "a man", but

26425-505: The third mission after, but Slayton designated David Scott as the pilot of Gemini   8. Scott was the first member of the third group of astronauts , who was selected on October 18, 1963, to receive a prime crew assignment. See was designated to command Gemini 9 . Henceforth, each Gemini mission was commanded by a member of Armstrong's group, with a member of Scott's group as the pilot. Conrad would be Armstrong's backup this time, and Richard F. Gordon Jr. his pilot. Armstrong became

26600-407: The throat and lungs boil away. More specifically, exposed bodily liquids such as saliva, tears, and liquids in the lungs boil away. Hence, at this altitude, human survival requires a pressure suit, or a pressurized capsule. Out in space, sudden exposure of an unprotected human to very low pressure , such as during a rapid decompression, can cause pulmonary barotrauma —a rupture of the lungs, due to

26775-427: The universe and the accelerating expansion of the universe , indicates that space has a non-zero vacuum energy , which is called dark energy . Estimates put the average energy density of the present day universe at the equivalent of 5.9 protons per cubic meter, including dark energy, dark matter, and baryonic matter (ordinary matter composed of atoms). The atoms account for only 4.6% of the total energy density, or

26950-478: The use of full term "outer space", with the earliest recorded use of this meaning in an epic poem by John Milton called Paradise Lost , published in 1667. The term outward space existed in a poem from 1842 by the English poet Lady Emmeline Stuart-Wortley called "The Maiden of Moscow", but in astronomy the term outer space found its application for the first time in 1845 by Alexander von Humboldt . The term

27125-399: The volume of the universe , but even galaxies and star systems consist almost entirely of empty space. Most of the remaining mass-energy in the observable universe is made up of an unknown form, dubbed dark matter and dark energy . Outer space does not begin at a definite altitude above Earth's surface. The Kármán line , an altitude of 100 km (62 mi) above sea level ,

27300-410: Was "the most technically capable of the early X-15 pilots". Bill Dana said Armstrong "had a mind that absorbed things like a sponge". Those who flew for the Air Force tended to have a different opinion, especially people like Chuck Yeager and Pete Knight , who did not have engineering degrees. Knight said that pilot-engineers flew in a way that was "more mechanical than it is flying", and gave this as

27475-536: Was a major U.S. victory in the Space Race , by fulfilling a national goal proposed in 1961 by President John F. Kennedy "of landing a man on the Moon and returning him safely to the Earth" before the end of the decade. Along with Collins and Aldrin, Armstrong was awarded the Presidential Medal of Freedom by President Richard Nixon and received the 1969 Collier Trophy . President Jimmy Carter presented him with

27650-557: Was assigned to VF-51 , an all-jet squadron, becoming its youngest officer, and made his first flight in a jet, a Grumman F9F Panther , on January 5, 1951. He was promoted to ensign on June 5, 1951, and made his first jet carrier landing on USS  Essex two days later. On June 28, 1951, Essex had set sail for Korea, with VF-51 aboard to act as ground-attack aircraft . VF-51 flew ahead to Naval Air Station Barbers Point in Hawaii, where it conducted fighter-bomber training before rejoining

27825-518: Was blown back over land. A jeep driven by a roommate from flight school picked him up; it is unknown what happened to the wreckage of his aircraft, F9F-2 BuNo 125122 . In all, Armstrong flew 78   missions over Korea for a total of 121   hours in the air, a third of them in January 1952, with the final mission on March 5, 1952. Of 492 U.S. Navy personnel killed in the Korean War, 27 of them were from Essex on this war cruise. Armstrong received

28000-508: Was chosen as part of the pilot consultant group for the X-20 Dyna-Soar , a military space plane under development by Boeing for the U.S. Air Force, and on March 15, 1962, he was selected by the U.S. Air Force as one of seven pilot-engineers who would fly the X-20 when it got off the design board. In April 1962, NASA sought applications for the second group of NASA astronauts for Project Gemini ,

28175-536: Was concerned that the LM was running low on fuel. On landing, Aldrin and Armstrong believed they had 40   seconds of fuel left, including the 20   seconds' worth which had to be saved in the event of an abort. During training, Armstrong had, on several occasions, landed with fewer than 15   seconds of fuel; he was also confident the LM could survive a fall of up to 50 feet (15 m). Post-mission analysis showed that at touchdown there were 45 to 50   seconds of propellant burn time left. The landing on

28350-419: Was depressurized, the hatch was opened, and Armstrong made his way down the ladder. At the bottom of the ladder, while standing on a Lunar Module landing pad, Armstrong said, "I'm going to step off the LM now". He turned and set his left boot on the lunar surface at 02:56 UTC July 21, 1969, then said, "That's one small step for [a] man, one giant leap for mankind." The exact time of Armstrong's first step on

28525-441: Was derived from testing of scale models and prototypes, either in wind tunnels or in the free atmosphere. More recently, advances in computing have enabled the use of computational fluid dynamics to simulate the behavior of the fluid, reducing time and expense spent on wind-tunnel testing. Those studying hydrodynamics or hydroacoustics often obtain degrees in aerospace engineering. Additionally, aerospace engineering addresses

28700-457: Was eventually popularized through the writings of H. G. Wells after 1901. Theodore von Kármán used the term of free space to name the space of altitudes above Earth where spacecrafts reach conditions sufficiently free from atmospheric drag, differentiating it from airspace , identifying a legal space above territories free from the sovereign jurisdiction of countries. " Spaceborne " denotes existing in outer space, especially if carried by

28875-458: Was largely empirical, with some concepts and skills imported from other branches of engineering. Some key elements, like fluid dynamics , were understood by 18th-century scientists. In December 1903, the Wright Brothers performed the first sustained, controlled flight of a powered, heavier-than-air aircraft, lasting 12 seconds. The 1910s saw the development of aeronautical engineering through

29050-647: Was passed by the United Nations General Assembly in 1963 and signed in 1967 by the Union of Soviet Socialist Republics (USSR), the United States of America (USA), and the United Kingdom (UK). As of 2017, 105 state parties have either ratified or acceded to the treaty. An additional 25 states signed the treaty, without ratifying it. Since 1958, outer space has been the subject of multiple United Nations resolutions. Of these, more than 50 have been concerning

29225-534: Was planned to last 75   hours and 55   orbits. After the Agena lifted off at 10:00:00 EST , the Titan II rocket carrying Armstrong and Scott ignited at 11:41:02 EST, putting them into an orbit from which they chased the Agena. They achieved the first-ever docking between two spacecraft. Contact with the crew was intermittent due to the lack of tracking stations covering their entire orbits. While out of contact with

29400-667: Was recognized by the Scouts with their Distinguished Eagle Scout Award and Silver Buffalo Award . While flying toward the Moon on July 18, 1969, he sent his regards to attendees at the National Scout jamboree in Idaho. Among the few personal items that he carried with him to the Moon and back was a World Scout Badge. At age 17, in 1947, Armstrong began studying aeronautical engineering at Purdue University in West Lafayette, Indiana ; he

29575-504: Was released from active duty on August 23, 1952, but remained in the reserve, and was promoted to lieutenant (junior grade) on May 9, 1953. As a reservist, he continued to fly, first with VF-724 at Naval Air Station Glenview in Illinois, and then, after moving to California, with VF-773 at Naval Air Station Los Alamitos . He remained in the reserve for eight years before resigning his commission on October 21, 1960. After his service with

29750-510: Was selected for the U.S. Air Force's Man in Space Soonest program, but the Advanced Research Projects Agency (ARPA) canceled its funding on August 1, 1958, and on November 5, 1958, it was superseded by Project Mercury , a civilian project run by NASA. As a NASA civilian test pilot, Armstrong was ineligible to become one of its astronauts at this time, as selection was restricted to military test pilots. In November 1960, he

29925-407: Was tasked with piloting chase planes during releases of experimental aircraft from modified bombers. He also flew the modified bombers, and on one of these missions had his first flight incident at Edwards. On March 22, 1956, he was in a Boeing B-29 Superfortress , which was to air-drop a Douglas D-558-2 Skyrocket . He sat in the right-hand co-pilot seat while pilot in command, Stan Butchart sat in

30100-771: Was the second person in his family to attend college. Armstrong was also accepted to the Massachusetts Institute of Technology (MIT), but he resolved to go to Purdue after watching a football game between the Purdue Boilermakers and the Ohio State Buckeyes at the Ohio Stadium in 1945 in which quarterback Bob DeMoss led the Boilermakers to a sound victory over the highly regarded Buckeyes. An uncle who attended MIT had also advised him that he could receive

30275-602: Was then sent to Naval Air Station Corpus Christi in Texas for training on the Grumman F8F Bearcat , culminating in a carrier landing on USS  Wright . On August 16, 1950, Armstrong was informed by letter that he was a fully qualified naval aviator . His mother and sister attended his graduation ceremony on August 23, 1950. Armstrong was assigned to Fleet Aircraft Service Squadron   7 (FASRON 7) at NAS San Diego (now known as NAS North Island). On November 27, 1950, he

30450-408: Was to practice space rendezvous and to develop procedures and equipment for a seven-day flight, all of which would be required for a mission to the Moon. With two other flights ( Gemini 3 and Gemini 4 ) in preparation, six crews were competing for simulator time, so Gemini   5 was postponed. It finally lifted off on August 21. Armstrong and See watched the launch at Cape Kennedy , then flew to

30625-441: Was torn off after it collided with a cable that was strung across the hills as a booby trap. He was flying 500 feet (150 m) above the ground when he hit it. While there was heavy anti-aircraft fire in the area, none hit Armstrong's aircraft. An initial report to the commanding officer of Essex said that Armstrong's F9F Panther was hit by anti-aircraft fire . The report indicated he was trying to regain control and collided with

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