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135-550: Telespazio Spa is a European spaceflight services company founded in 1961. It is a joint venture owned by Leonardo (67%) and Thales Group (33%) headquartered in Rome . Telespazio provides services that include the design and development of space systems, the management of launch services and in-orbit satellite control, Earth observation services, integrated communications, satellite navigation and localization and scientific programmes. The company manages space infrastructure , such as

270-421: A spaceport (cosmodrome), which may be equipped with launch complexes and launch pads for vertical rocket launches and runways for takeoff and landing of carrier airplanes and winged spacecraft. Spaceports are situated well away from human habitation for noise and safety reasons. ICBMs have various special launching facilities. A launch is often restricted to certain launch windows . These windows depend upon

405-492: A sub-orbital spaceflight the spacecraft reaches space and then returns to the atmosphere after following a (primarily) ballistic trajectory. This is usually because of insufficient specific orbital energy , in which case a suborbital flight will last only a few minutes, but it is also possible for an object with enough energy for an orbit to have a trajectory that intersects the Earth's atmosphere, sometimes after many hours. Pioneer 1

540-508: A "time buffer" and substantially widened the allowable launch windows . The parking orbit gave the crew and controllers time to thoroughly check out the spacecraft after the stresses of launch before committing it for a long journey to the Moon. Robotic missions do not require an abort capability and require radiation minimalization only for delicate electronics, and because modern launchers routinely meet "instantaneous" launch windows, space probes to

675-443: A counter measure to United States bomber planes in the 1950s. The Tsiolkovsky-influenced Sergey Korolev became the chief rocket designer, and derivatives of his R-7 Semyorka missiles were used to launch the world's first artificial Earth satellite , Sputnik 1 , on October 4, 1957. The U.S., after the launch of Sputnik and two embarrassing failures of Vanguard rockets , launched Explorer 1 on February 1, 1958. Three years later,

810-416: A flight that normally lasts over twenty hours , could be traversed in less than one hour. While no company offers this type of transportation today, SpaceX has revealed plans to do so as early as the 2020s using Starship . Suborbital spaceflight over an intercontinental distance requires a vehicle velocity that is only a little lower than the velocity required to reach low Earth orbit. If rockets are used,

945-447: A launch tower and flame trench. It is surrounded by equipment used to erect, fuel, and maintain launch vehicles. Before launch, the rocket can weigh hundreds of tons. The Space Shuttle Columbia , on STS-1 , weighed 2030 metric tons (4,480,000 lb) at takeoff. The most commonly used definition of outer space is everything beyond the Kármán line , which is 100 kilometers (62 mi) above

1080-667: A leader of the opposition to Antonescu, entered into secret negotiations with British diplomats who made it clear that Romania had to seek reconciliation with the Soviet Union. To facilitate the coordination of their activities against Antonescu's regime, the National Liberal and National Peasants' parties established the National Democratic Bloc, which also included the Social Democratic and Communist parties. After

1215-585: A liquid-fueled rocket on March 16, 1926. During World War II , the first guided rocket, the V-2 , was developed and employed as a weapon by Nazi Germany . During a test flight in June 1944, one such rocket reached space at an altitude of 189 kilometers (102 nautical miles), becoming the first human-made object to reach space. At the end of World War II, most of the V-2 rocket team, including its head, Wernher von Braun , surrendered to

1350-546: A memorandum of understanding with NASA to engage itself in the Landsat program , gathering satellite imagery for Earth Observation purposes according to the signed in May 1974. During that same year, Telespazio became involved in the development of the Sirio programme , thus helping to launch the first Italian telecommunications satellite during 1977. Other major activities of the decade included

1485-495: A new state under Ottoman suzerainty, the Principality of Transylvania . Reformation spread and four denominations— Calvinism , Lutheranism , Unitarianism , and Roman Catholicism—were officially acknowledged in 1568. The Romanians' Orthodox faith remained only tolerated, although they made up more than one-third of the population, according to 17th-century estimations. The princes of Transylvania, Wallachia, and Moldavia joined

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1620-510: A policy of total reimbursement of the foreign debt by imposing austerity steps that impoverished the population and exhausted the economy. The process succeeded in repaying all of Romania's foreign government debt in 1989. At the same time, Ceaușescu greatly extended the authority of the Securitate secret police and imposed a severe cult of personality , which led to a dramatic decrease in the dictator's popularity and culminated in his overthrow in

1755-546: A political crisis in 2012. Near the end of 2013, The Economist reported Romania again enjoying "booming" economic growth at 4.1% that year, with wages rising fast and a lower unemployment than in Britain. Economic growth accelerated in the midst of government liberalisation in opening up new sectors to competition and investment—most notably, energy and telecoms. In 2016, the Human Development Index ranked Romania as

1890-611: A pre-programmed list of operations that will be executed unless otherwise instructed. A robotic spacecraft for scientific measurements is often called a space probe or space observatory . Many space missions are more suited to telerobotic rather than crewed operation, due to lower cost and risk factors. In addition, some planetary destinations such as Venus or the vicinity of Jupiter are too hostile for human survival, given current technology. Outer planets such as Saturn , Uranus , and Neptune are too distant to reach with current crewed spaceflight technology, so telerobotic probes are

2025-607: A principle was enacted, but women could not vote or be candidates. Calypso Botez established the National Council of Romanian Women to promote feminist ideas. Romania was a multiethnic country, with ethnic minorities making up about 30% of the population, but the new constitution declared it a unitary national state in 1923. Although minorities could establish their own schools, Romanian language, history and geography could only be taught in Romanian. Agriculture remained

2160-719: A regular tribute to the Ottoman sultans from 1417 and 1456, respectively. A military commander of Romanian origin, John Hunyadi , organised the defence of the Kingdom of Hungary until his death in 1456. Increasing taxes outraged the Transylvanian peasants, and they rose up in an open rebellion in 1437, but the Hungarian nobles and the heads of the Saxon and Székely communities jointly suppressed their revolt. The formal alliance of

2295-594: A result of Hungarian oppression in the region. In April 1990, a sit-in protest contesting the results of that year's legislative elections and accusing the FSN, including Iliescu, of being made up of former Communists and members of the Securitate grew rapidly to become what was called the Golaniad . Peaceful demonstrations degenerated into violence, prompting the intervention of coal miners summoned by Iliescu. This episode has been documented widely by both local and foreign media, and

2430-522: A significant improvement in living standards as the country successfully reduced domestic poverty and established a functional democratic state. However, Romania's development suffered a major setback during the late 2000s' recession leading to a large gross domestic product contraction and a budget deficit in 2009. This led to Romania borrowing from the International Monetary Fund. Worsening economic conditions led to unrest and triggered

2565-466: A successful Soviet offensive, the young King Michael I ordered Antonescu's arrest and appointed politicians from the National Democratic Bloc to form a new government on 23 August 1944. Romania switched sides during the war, and nearly 250,000 Romanian troops joined the Red Army's military campaign against Hungary and Germany, but Joseph Stalin regarded the country as an occupied territory within

2700-491: Is done by a set of orbital maneuvers called space rendezvous . After rendezvousing with the space station, the space vehicle then docks or berths with the station. Docking refers to joining of two separate free-flying space vehicles, while berthing refers to mating operations where an inactive vehicle is placed into the mating interface of another space vehicle by using a robotic arm . Vehicles in orbit have large amounts of kinetic energy. This energy must be discarded if

2835-887: Is effective mainly because of its ability to sustain thrust even as the atmosphere thins. Many ways to reach space other than rocket engines have been proposed. Ideas such as the space elevator , and momentum exchange tethers like rotovators or skyhooks require new materials much stronger than any currently known. Electromagnetic launchers such as launch loops might be feasible with current technology. Other ideas include rocket-assisted aircraft/spaceplanes such as Reaction Engines Skylon (currently in early stage development), scramjet powered spaceplanes, and RBCC powered spaceplanes. Gun launch has been proposed for cargo. On some missions beyond LEO (Low Earth Orbit) , spacecraft are inserted into parking orbits, or lower intermediary orbits. The parking orbit approach greatly simplified Apollo mission planning in several important ways. It acted as

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2970-692: Is first attested in the 16th century by Italian humanists travelling in Transylvania , Moldavia , and Wallachia . The oldest known surviving document written in Romanian that can be precisely dated, a 1521 letter known as the " Letter of Neacșu from Câmpulung ", is notable for including the first documented occurrence of Romanian in a country name: Wallachia is mentioned as Țara Rumânească . Human remains found in Peștera cu Oase ("Cave with Bones"), radiocarbon date from circa 40,000 years ago, and represent

3105-586: Is impossible. To date several academics have studied intergalactic travel in a serious manner. Spacecraft are vehicles designed to operate in space. The first 'true spacecraft' is sometimes said to be Apollo Lunar Module , since this was the only crewed vehicle to have been designed for, and operated only in space; and is notable for its non-aerodynamic shape. Spacecraft today predominantly use rockets for propulsion , but other propulsion techniques such as ion drives are becoming more common, particularly for uncrewed vehicles, and this can significantly reduce

3240-541: Is known as Kessler syndrome . There are several terms that refer to a flight into or through outer space . A space mission refers to a spaceflight intended to achieve an objective. Objectives for space missions may include space exploration , space research , and national firsts in spaceflight. Space transport is the use of spacecraft to transport people or cargo into or through outer space. This may include human spaceflight and cargo spacecraft flight. The first theoretical proposal of space travel using rockets

3375-647: Is more fuel-efficient for a craft to burn its fuel as close as possible to its periapsis (lowest point); see Oberth effect . Astrodynamics is the study of spacecraft trajectories, particularly as they relate to gravitational and propulsion effects. Astrodynamics allows for a spacecraft to arrive at its destination at the correct time without excessive propellant use. An orbital maneuvering system may be needed to maintain or change orbits. Non-rocket orbital propulsion methods include solar sails , magnetic sails , plasma-bubble magnetic systems , and using gravitational slingshot effects. The term "transfer energy" means

3510-451: Is not generally recognized by the public that the increase in potential energy required to pass the Kármán line is only about 3% of the orbital energy (potential plus kinetic energy) required by the lowest possible Earth orbit (a circular orbit just above the Kármán line.) In other words, it is far easier to reach space than to stay there. On May 17, 2004, Civilian Space eXploration Team launched

3645-698: Is remembered as the June 1990 Mineriad . The subsequent disintegration of the Front produced several political parties, including most notably the Social Democratic Party (PDSR then PSD) and the Democratic Party (PD and subsequently PDL). The former governed Romania from 1990 until 1996 through several coalitions and governments, with Ion Iliescu as head of state. Since then, there have been several other democratic changes of government: in 1996 Emil Constantinescu

3780-641: Is the fifth spacecraft put on an escape trajectory leaving the Solar System . Voyager 1 , Voyager 2 , Pioneer 10 , Pioneer 11 are the earlier ones. The one farthest from the Sun is Voyager 1 , which is more than 100 AU distant and is moving at 3.6 AU per year. In comparison, Proxima Centauri , the closest star other than the Sun, is 267,000 AU distant. It will take Voyager 1 over 74,000 years to reach this distance. Vehicle designs using other techniques, such as nuclear pulse propulsion are likely to be able to reach

3915-602: Is well documented from the end of the 11th century. Scholars who reject the Daco-Roman continuity theory say that the first Vlach groups left their Balkan homeland for the mountain pastures of the eastern and southern Carpathians in the 11th century, establishing the Romanians' presence in the lands to the north of the Lower Danube. Exposed to nomadic incursions, Transylvania developed into an important border province of

4050-656: The 2008 summit in Bucharest. The country applied in June 1993 for membership in the European Union and became an Associated State of the EU in 1995, an Acceding Country in 2004, and a full member on 1 January 2007. During the 2000s, Romania had one of the highest economic growth rates in Europe and has been referred at times as "the Tiger of Eastern Europe". This has been accompanied by

4185-781: The Arab countries and the Palestine Liberation Organization (PLO) allowed Romania to play a key role in the Israel– Egypt and Israel–PLO peace talks. As Romania's foreign debt increased sharply between 1977 and 1981 (from US$ 3 billion to $ 10 billion), the influence of international financial organisations—such as the International Monetary Fund (IMF) and the World Bank —grew, gradually conflicting with Ceaușescu's autocratic rule. He eventually initiated

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4320-753: The Danubian Principalities ) in 1774. Taking advantage of the Greek War of Independence , a Wallachian lesser nobleman, Tudor Vladimirescu, stirred up a revolt against the Ottomans in January ;1821, but he was murdered in June by Phanariot Greeks. After a new Russo-Turkish War , the Treaty of Adrianople strengthened the autonomy of the Danubian Principalities in 1829, although it also acknowledged

4455-821: The Fucino Space Centre - and is involved in programmes including Galileo , EGNOS , Copernicus, COSMO-SkyMed , SICRAL and Göktürk. Telespazio operates in France as Telespazio France; in Germany as Telespazio Germany , GAF and Spaceopal; in the United Kingdom as Telespazio VEGA UK ; in Spain as Telespazio Ibérica; and in Romania as Rartel. Telespazio operates in South America through Telespazio Brasil and Telespazio Argentina. In Italy,

4590-667: The Holy League against the Ottoman Empire in 1594. The Wallachian prince, Michael the Brave , united the three principalities under his rule in May ;1600. The neighboring powers forced him to abdicate in September, but he became a symbol of the unification of the Romanian lands in the 19th century. Although the rulers of the three principalities continued to pay tribute to the Ottomans,

4725-572: The Kingdom of Hungary . The Székelys—a community of free warriors—settled in central Transylvania around 1100 and moved to the easternmost regions around 1200. Colonists from the Holy Roman Empire —the Transylvanian Saxons ' ancestors—came to the province in the 1150s. A high-ranking royal official, styled voivode , ruled the Transylvanian counties from the 1170s, but

4860-637: The Republic of Genoa started establishing colonies on the Black Sea, including Calafat , and Constanța . The Mongols destroyed large territories during their invasion of Eastern and Central Europe in 1241 and 1242. The Mongols' Golden Horde emerged as the dominant power of Eastern Europe, but Béla IV of Hungary's land grant to the Knights Hospitallers in Oltenia and Muntenia shows that

4995-595: The Tripartite Pact of Germany, Italy and Japan on 23 November. The Iron Guard staged a coup against Antonescu, but he crushed the riot with German support and introduced a military dictatorship in early 1941. Romania entered World War II soon after the German invasion of the Soviet Union in June 1941. The country regained Bessarabia and Northern Bukovina, and the Germans placed Transnistria (the territory between

5130-478: The Tsiolkovsky rocket equation , can be used to find the total Δ v {\displaystyle \Delta v} , or potential change in velocity. This formula, which is still used by engineers, is a key concept of spaceflight. Spaceflight became a practical possibility with the work of Robert H. Goddard 's publication in 1919 of his paper A Method of Reaching Extreme Altitudes . His application of

5265-457: The USSR made one orbit around the Earth. In official Soviet documents, there is no mention of the fact that Gagarin parachuted the final seven miles. As of 2020, the only spacecraft regularly used for human spaceflight are Soyuz , Shenzhou , and Crew Dragon . The U.S. Space Shuttle fleet operated from April 1981 until July 2011. SpaceShipOne has conducted three human suborbital space flights. On

5400-452: The de Laval nozzle to liquid-fuel rockets improved efficiency enough for interplanetary travel to become possible. After further research, Goddard attempted to secure an Army contract for a rocket-propelled weapon in the first World War but his plans were foiled by the November 11, 1918 armistice with Germany . After choosing to work with private financial support, he was the first to launch

5535-583: The first constitution of Romania in the same year. The Great Powers acknowledged Romania's full independence at the Congress of Berlin and Carol I was crowned king in 1881. The Congress also granted the Danube Delta and Dobruja to Romania. Although Romanian scholars strove for the unification of all Romanians into a Greater Romania , the government did not openly support their irredentist projects. The Transylvanian Romanians and Saxons wanted to maintain

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5670-571: The national flag . In Transylvania, most Romanians supported the imperial government against the Hungarian revolutionaries after the Diet passed a law concerning the union of Transylvania and Hungary. Bishop Andrei Șaguna proposed the unification of the Romanians of the Habsburg Monarchy in a separate duchy, but the central government refused to change the internal borders. The Treaty of Paris put

5805-592: The sixth-most populous member state of the European Union . Europe's second-longest river, the Danube , empties into the Danube Delta in the southeast of the country. The Carpathian Mountains cross Romania from the north to the southwest and include Moldoveanu Peak , at an altitude of 2,544 m (8,346 ft). Romania's capital and largest city is Bucharest . Other major urban centers include Cluj-Napoca , Timișoara , Iași , Constanța and Brașov . Settlement in

5940-401: The 1930s. The democratic parties were squeezed between conflicts with the fascist and anti-Semitic Iron Guard and the authoritarian tendencies of King Carol II . The King promulgated a new constitution and dissolved the political parties in 1938, replacing the parliamentary system with a royal dictatorship. The 1938 Munich Agreement convinced King Carol II that France and

6075-695: The ARGO project, the first closed network equipped with small fixed antennas for emergency communications, intended for Italian civil protection. During 1994, Telespazio Argentina , based in Buenos Aires , is established. On 30 April 1996, the BeppoSAX scientific satellite, operated by the firm, was launched. In the following year, it founded its second subsidiary, Telespazio Brasil , based in Rio de Janeiro . During 1998, Telespazio partnered with Romanian firm Radiocom to establish

6210-651: The Axis but switched to the Allies in 1944. After the war, Romania became a socialist republic and a member of the Warsaw Pact , transitioning to democracy and a market economy after the 1989 Revolution . Romania is a developing country with a high-income economy , recognized as a middle power in international affairs . It hosts several UNESCO World Heritage Sites and is a growing tourist attraction, receiving 13 million foreign visitors in 2023 . Its economy ranks among

6345-520: The Bulgar elite had already begun in the 9th century. Following the conquest of southern Transylvania around 830, people from the Bulgar Empire mined salt at the local salt mines. The Council of Preslav declared Old Church Slavonic the language of liturgy in the country in 893. The Vlachs also adopted Old Church Slavonic as their liturgical language. The Magyars (or Hungarians) took control of

6480-622: The Cucuteni–Trypillia culture built the largest settlements in Neolithic Europe , some of which contained as many as three thousand structures and were possibly inhabited by 20,000 to 46,000 people. The first fortified settlements appeared around 1800 BC, showing the militant character of Bronze Age societies. Greek colonies established on the Black Sea coast in the 7th century BC became important centres of commerce with

6615-399: The Danubian Principalities under the collective guardianship of the Great Powers in 1856. After special assemblies convoked in Moldavia and Wallachia urged the unification of the two principalities , the Great Powers did not prevent the election of Alexandru Ioan Cuza as their collective domnitor (or ruling prince) in January 1859. The united principalities officially adopted

6750-403: The Earth's surface. (The United States defines outer space as everything beyond 50 miles (80 km) in altitude.) Rocket engines remain the only currently practical means of reaching space, with planes and high-altitude balloons failing due to lack of atmosphere and alternatives such as space elevators not yet being built. Chemical propulsion, or the acceleration of gases at high velocities,

6885-401: The European Pontic steppe , occupied the Lower Danube region in 680. After the Avar Khaganate collapsed in the 790s, the First Bulgarian Empire became the dominant power of the region, occupying lands as far as the river Tisa . The First Bulgarian Empire had a mixed population consisting of the Bulgar conquerors, Slavs , and Vlachs (or Romanians) but the Slavicisation of

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7020-444: The Gemini program ended just before the Apollo 1 tragedy. Following multiple uncrewed test flights of the Saturn 1B and the Saturn V , the U.S. launched the crewed Apollo 7 mission into low earth orbit . Shortly after its successful completion, the U.S. launched Apollo 8 (first mission to orbit the moon), Apollo 9 (first Apollo mission to launch with both the CSM and the LEM ) and Apollo 10 (first mission to nearly land on

7155-406: The GoFast rocket on a suborbital flight, the first amateur spaceflight. On June 21, 2004, SpaceShipOne was used for the first privately funded human spaceflight . Point-to-point, or Earth to Earth transportation, is a category of sub-orbital spaceflight in which a spacecraft provides rapid transport between two terrestrial locations. A conventional airline route between London and Sydney ,

7290-414: The Hungarian, Saxon, and Székely leaders, known as the Union of the Three Nations , became an important element of the self-government of Transylvania. The Orthodox Romanian knezes ("chiefs") were excluded from the Union. The Kingdom of Hungary collapsed, and the Ottomans occupied parts of Banat and Crișana in 1541. Transylvania and Maramureș , along with the rest of Banat and Crișana developed into

7425-408: The Moon and developed continuous crewed human presence in space with a series of space stations , ranging from the Salyut program to the International Space Station . Rockets are the only means currently capable of reaching orbit or beyond. Other non-rocket spacelaunch technologies have yet to be built, or remain short of orbital speeds. A rocket launch for a spaceflight usually starts from

7560-423: The Moon and other planets generally use direct injection to maximize performance by limiting the boil off of cryogenic propellants . Although some might coast briefly during the launch sequence, they do not complete one or more full parking orbits before the burn that injects them onto an Earth escape trajectory. The escape velocity from a celestial body decreases as the distance from the body increases. However, it

7695-404: The Orthodox Romanian prelates to accept the union with the Roman Catholic Church in 1699. The Church Union strengthened the Romanian intellectuals' devotion to their Roman heritage. The Orthodox Church was restored in Transylvania only after Orthodox monks stirred up revolts in 1744 and 1759. The organisation of the Transylvanian Military Frontier caused further disturbances, especially among

7830-417: The Rartel Company, thus developing a presence in this country as well. That same year, the firm finalised an agreement with European satellite operator Eutelsat to take control and commercialise of the EMS payload carried on the Italsat F2 communications satellite. On 7 February 2001, Italy's first military communications satellite system, the Telespazio-managed SICRAL 1 , was launched. During December 2002,

7965-483: The Romanian army on behalf of the Entente Powers a day before Germany capitulated on 11 November 1918. Austria-Hungary quickly disintegrated after the war. The General Congress of Bukovina proclaimed the union of the province with Romania on 28 November 1918, and the Grand National Assembly proclaimed the union of Transylvania, Banat, Crișana and Maramureș with the kingdom on 1 December. Peace treaties with Austria, Bulgaria and Hungary delineated

8100-403: The Romanians as the fourth privileged nation was forced into exile. Uniate and Orthodox clerics and laymen jointly signed a plea for the Transylvanian Romanians' emancipation in 1791, but the monarch and the local authorities refused to grant their requests. The Treaty of Küçük Kaynarca authorised the Russian ambassador in Istanbul to defend the autonomy of Moldavia and Wallachia (known as

8235-407: The September 1943 Allied armistice with Italy , Romania became the second Axis power in Europe in 1943–1944. After the German occupation of Hungary in March 1944, about 132,000 Jews – mainly Hungarian-speaking – were deported to extermination camps from Northern Transylvania with the Hungarian authorities' support. After the Soviet victory in the Battle of Stalingrad in 1943, Iuliu Maniu ,

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8370-399: The Soviet Union on 26 June 1940, Northern Transylvania to Hungary on 30 August, and Southern Dobruja to Bulgaria in September. After the territorial losses, the King was forced to abdicate in favour of his minor son, Michael I , on 6 September, and Romania was transformed into a national-legionary state under the leadership of General Ion Antonescu . Antonescu signed

8505-409: The Soviet sphere of influence. Stalin's deputy instructed the King to make the Communists' candidate, Petru Groza , the prime minister in March 1945. The Romanian administration in Northern Transylvania was soon restored, and Groza's government carried out an agrarian reform. In February 1947, the Paris Peace Treaties confirmed the return of Northern Transylvania to Romania, but they also legalised

8640-415: The Soviet-led 1968 invasion of Czechoslovakia . Ceaușescu even publicly condemned the action as "a big mistake, [and] a serious danger to peace in Europe and to the fate of Communism in the world". It was the only Communist state to maintain diplomatic relations with Israel after 1967's Six-Day War and established diplomatic relations with West Germany the same year. At the same time, close ties with

8775-405: The Székely and Saxon seats (or districts) were not subject to the voivodes' authority. Royal charters wrote of the " Vlachs ' land" in southern Transylvania in the early 13th century, indicating the existence of autonomous Romanian communities . Papal correspondence mentions the activities of Orthodox prelates among the Romanians in Muntenia in the 1230s. Also in the 13th century,

8910-472: The Székelys in 1764 . Princes Dimitrie Cantemir of Moldavia and Constantin Brâncoveanu of Wallachia concluded alliances with the Habsburg Monarchy and Russia against the Ottomans, but they were dethroned in 1711 and 1714, respectively. The sultans lost confidence in the native princes and appointed Orthodox merchants from the Phanar district of Istanbul to rule Moldova and Wallachia. The Phanariot princes pursued oppressive fiscal policies and dissolved

9045-436: The UK-based VEGA (the latter was subsequently renamed Telespazio VEGA UK ) for an undisclosed price. On 20 September 2011, a strike at the company reportedly caused a delay in the launch of an Ariane 5 heavy-lift launch vehicle . During 2017, Thales Alenia Space and Telespazio formed a partnership with Seattle -based Spaceflight Industries to accelerate plans for a constellation of 60 Earth observation satellites. In

9180-410: The USA on the 20th anniversary of Yuri Gagarin 's flight, on 12 April 1981. During the Shuttle era, six orbiters were built, all of which flown in the atmosphere and five of which flown in space. The Enterprise was used only for approach and landing tests, launching from the back of a Boeing 747 and gliding to deadstick landings at Edwards AFB, California . The first Space Shuttle to fly into space

9315-434: The USSR launched Vostok 1, carrying cosmonaut Yuri Gagarin into orbit. The US responded with the suborbital launch of Alan Shepard on May 5, 1961, and the orbital launch of John Glenn on February 20, 1962. These events were followed by a pledge from U.S. President John F. Kennedy to go to the moon and the creation of the Gemini and Apollo programs. After successfully performing a rendezvous and docking and an EVA ,

9450-409: The United Kingdom could not defend Romanian interests. German preparations for a new war required the regular supply of Romanian oil and agricultural products. The two countries concluded a treaty concerning the coordination of their economic policies in 1939, but the King could not persuade Adolf Hitler to guarantee Romania's frontiers. Romania was forced to cede Bessarabia and Northern Bukovina to

9585-498: The United States, and were expatriated to work on American missiles at what became the Army Ballistic Missile Agency , producing missiles such as Juno I and Atlas . The Soviet Union , in turn, captured several V2 production facilities and built several replicas, with 5 of their 11 rockets successfully reaching their targets. (This was relatively consistent with Nazi Germany's success rate.) The Soviet Union developed intercontinental ballistic missiles to carry nuclear weapons as

9720-432: The ability to deorbit themselves. This becomes a major issue when large numbers of uncontrollable spacecraft exist in frequently used orbits, increasing the risk of debris colliding with functional satellites. This problem is exacerbated when large objects, often upper stages, break up in orbit or collide with other objects, creating often hundreds of small, hard to find pieces of debris. This problem of continuous collisions

9855-659: The army. The neighboring powers took advantage of the situation: the Habsburg Monarchy annexed the northwestern part of Moldavia, or Bukovina , in 1775, and the Russian Empire seized the eastern half of Moldavia, or Bessarabia , in 1812. A census revealed that the Romanians were more numerous than any other ethnic group in Transylvania in 1733, but legislation continued to use contemptuous adjectives (such as "tolerated" and "admitted") when referring to them. The Uniate bishop , Inocențiu Micu-Klein who demanded recognition of

9990-570: The company is also present through e-GEOS. On 18 October 1961, Telespazio was established under the auspices of several Italian organisations, including the National Research Council (CNR) and the Post and Telecommunications Ministry , Italcable and Rai . During the following year, NASA signed a memorandum of understanding with Telespazio to test the Telstar and Relay satellites. In 1963,

10125-489: The country and proclaimed Romania a people's republic . Romania remained under the direct military occupation and economic control of the USSR until the late 1950s. During this period, Romania's vast natural resources were drained continuously by mixed Soviet-Romanian companies ( SovRoms ) set up for unilateral exploitative purposes. In 1948, the state began to nationalise private firms and to collectivise agriculture. Until

10260-531: The creation of a new space-orientated alliance between Thales and Finmeccanica. Prior to approving the change, the EC had performed an in-depth investigation due to concerns that the transfer may have had a detrimental effect on downstream satellite and subsystem competition. In January 2011, Telespazio acquired the space activities of two Finmeccanica subsidiares, the Italy-based Elsag Datamat Space and

10395-429: The crossroads of Eastern and Southeast Europe . It borders Ukraine to the north and east, Hungary to the west, Serbia to the southwest, Bulgaria to the south, Moldova to the east, and the Black Sea to the southeast. It has a mainly continental climate , and an area of 238,397 km (92,046 sq mi) with a population of 19 million people (2023). Romania is the twelfth-largest country in Europe and

10530-593: The early 1960s, the government severely curtailed political liberties and vigorously suppressed any dissent with the help of the Securitate —the Romanian secret police. During this period the regime launched several campaigns of purges during which numerous " enemies of the state " and "parasite elements" were targeted for different forms of punishment including: deportation, internal exile, internment in forced labour camps and prisons—sometimes for life—as well as extrajudicial killing . Nevertheless, anti-communist resistance

10665-557: The early 7th century. The Goths were expanding towards the Lower Danube from the 230s, forcing the native peoples to flee to the Roman Empire or to accept their suzerainty . The Goths' rule ended abruptly when the Huns invaded their territory in 376, causing new waves of migrations. The Huns forced the remnants of the local population into submission, but their empire collapsed in 454. The Gepids took possession of

10800-414: The evacuation of the province Dacia Trajana in the 270s. Scholars supporting the continuity theory are convinced that most Latin-speaking commoners stayed behind when the army and civil administration were withdrawn. The Romans did not abandon their fortresses along the northern banks of the Lower Danube for decades, and Dobruja (known as Scythia Minor ) remained an integral part of the Roman Empire until

10935-463: The fact that most of the former industrial and economic enterprises which were built and operated during the communist period were closed, mainly as a result of the policies of privatisation of the post–1989 regimes. Corruption has been a major issue in contemporary Romanian politics. In November 2015, massive anti-corruption protests which developed in the wake of the Colectiv nightclub fire led to

11070-643: The fastest growing in the European Union, primarily driven by the service sector . Romania is a net exporter of cars and electric energy worldwide, and its citizens benefit from some of the fastest internet speeds globally . Romania is a member of several international organizations , including the European Union , NATO , and the BSEC . "Romania" derives from the local name for Romanian ( Romanian : român ), which in turn derives from Latin romanus , meaning " Roman " or "of Rome ". This ethnonym for Romanians

11205-595: The federalisation of Austria-Hungary and the Romanian intellectuals established a cultural association to promote the use of Romanian. Fearing Russian expansionism, Romania secretly joined the Triple Alliance of Germany, Austria-Hungary, and Italy in 1883, but public opinion remained hostile to Austria-Hungary. Romania seized Southern Dobruja from Bulgaria in the Second Balkan War in 1913. German and Austrian-Hungarian diplomacy supported Bulgaria during

11340-517: The firm became a part of the Italian aerospace conglomerate Finmeccanica ; the acquisition had involved a lengthy period of negotiation with Telespazio's former parent company, Telecom Italia . On 25 July 2003, Telespazio acquired the German Earth observation satellite services specialist GAF AG . The company became a Franco-Italian joint venture on 1 July 2005, through a merger between Telespazio and

11475-544: The first signals from the Telstar satellite were received by the new Fucino testing station ( Ortucchio , Abruzzo), the first pictures came through a few months later. During 1964, Telespazio helped create history for its role in facilitating the first television broadcasts, directly from Fucino via the Telstar satellite. During the following year, it signed its first agreement with communications satellite service provider Intelsat ; in June 1965, commercial telecommunications traffic

11610-467: The following year, Orange S.A. teamed up with the firm to provide satellite-based telecommunications to the French military. In September 2019, Airbus partnered with Telespazio to market military telecommunications services using the future Syracuse IV satellites. Spaceflight Spaceflights include the launches of Earth observation and telecommunications satellites, interplanetary missions ,

11745-516: The former Dacia province. Place names that are of Slavic origin abound in Romania, indicating that a significant Slavic-speaking population lived in the territory. The first Slavic groups settled in Moldavia and Wallachia in the 6th century, in Transylvania around 600. The nomadic Avars defeated the Gepids and established a powerful empire around 570. The Bulgars , who also came from

11880-801: The in-orbit control of satellites, and the opening of a second space centre in Gera Lario , Lombardia in 1977. In the 1980s, the company continued to be involved in the development of several Italian space-related programmes, such as Italsat. During 1983, under the auspices of CNR and subsequently, the Italian Space Agency (ASI), Telespazio established and managed the Matera Space Center for Geodesy Operations. In 1987, it inaugurated its third space center handling satellites communications, based in Scanzano , Palermo . On 30 May 1991, Telespazio launched

12015-457: The local Vlach rulers were subject to the king's authority in 1247. Basarab I of Wallachia united the Romanian polities between the southern Carpathians and the Lower Danube in the 1310s. He defeated the Hungarian royal army in the Battle of Posada and secured the independence of Wallachia in 1330. The second Romanian principality, Moldavia , achieved full autonomy during

12150-625: The local chieftains and established Roman Catholic bishoprics (office of a bishop) in Transylvania and Banat in the early 11th century. Significant Pecheneg groups fled to the Byzantine Empire in the 1040s; the Oghuz Turks followed them, and the nomadic Cumans became the dominant power of the steppes in the 1060s. Cooperation between the Cumans and the Vlachs against the Byzantine Empire

12285-669: The local tribes. Among the native peoples, Herodotus listed the Getae of the Lower Danube region, the Agathyrsi of Transylvania and the Syginnae of the plains along the river Tisza at the beginning of the 5th century BC. Centuries later, Strabo associated the Getae with the Dacians who dominated the lands along the southern Carpathian Mountains in the 1st century BC. Burebista

12420-409: The moon). These events culminated with the first crewed moon landing, Apollo 11 , and six subsequent missions, five of which successfully landed on the moon. Spaceflight has been widely employed by numerous government and commercial entities for placing satellites into orbit around Earth for a broad range of purposes. Certain government agencies have also sent uncrewed spacecraft exploring space beyond

12555-559: The most talented princes— Gabriel Bethlen of Transylvania, Matei Basarab of Wallachia, and Vasile Lupu of Moldavia—strengthened their autonomy. The united armies of the Holy League expelled the Ottoman troops from Central Europe between 1684 and 1699, and the Principality of Transylvania was integrated into the Habsburg monarchy . The Habsburgs supported the Catholic clergy and persuaded

12690-470: The name Romania on 21 February 1862. Cuza's government carried out a series of reforms, including the secularisation of the property of monasteries and agrarian reform, but a coalition of conservative and radical politicians forced him to abdicate in February ;1866. Cuza's successor, a German prince, Karl of Hohenzollern-Sigmaringen (or Carol I), was elected in May. The parliament adopted

12825-406: The nearest star significantly faster. Another possibility that could allow for human interstellar spaceflight is to make use of time dilation , as this would make it possible for passengers in a fast-moving vehicle to travel further into the future while aging very little, in that their great speed slows down the rate of passage of on-board time. However, attaining such high speeds would still require

12960-519: The new borders in 1919 and 1920, but the Soviet Union did not acknowledge the loss of Bessarabia. Romania achieved its greatest territorial extent, expanding from the pre-war 137,000 to 295,000 km (53,000 to 114,000 sq mi). A new electoral system granted voting rights to all adult male citizens, and a series of radical agrarian reforms transformed the country into a "nation of small landowners" between 1918 and 1921. Gender equality as

13095-778: The oldest known Homo sapiens in Europe. Neolithic agriculture spread after the arrival of a mixed group of people from Thessaly in the 6th millennium BC. Excavations near a salt spring at Lunca yielded the earliest evidence for salt exploitation in Europe; here salt production began between the 5th and 4th millennium BC. The first permanent settlements developed into "proto-cities", which were larger than 320 hectares (800 acres). The Cucuteni–Trypillia culture —the best known archaeological culture of Old Europe —flourished in Muntenia , southeastern Transylvania and northeastern Moldavia between c. 5500 to 2750 BC. During its middle phase (c. 4000 to 3500 BC), populations belonging to

13230-402: The only way to explore them. Telerobotics also allows exploration of regions that are vulnerable to contamination by Earth micro-organisms since spacecraft can be sterilized. Humans can not be sterilized in the same way as a spaceship, as they coexist with numerous micro-organisms, and these micro-organisms are also hard to contain within a spaceship or spacesuit. The first uncrewed space mission

13365-405: The opinion polls. This surprise victory was attributed by many analysts to the implication of the Romanian diaspora in the voting process, with almost 50% casting their votes for Klaus Iohannis in the first round, compared to only 16% for Ponta. In 2019, Iohannis was re-elected president in a landslide victory over former Prime Minister Viorica Dăncilă . The post–1989 period is characterised by

13500-399: The position of celestial bodies and orbits relative to the launch site. The biggest influence is often the rotation of the Earth. Once launched, orbits are normally located within relatively constant flat planes at a fixed angle to the axis of the Earth, and the Earth rotates within this orbit. A launch pad is a fixed structure designed to dispatch airborne vehicles. It generally consists of

13635-592: The presence of units of the Red Army in the country. During the Soviet occupation of Romania , the communist-dominated government called for new elections in 1946, which they fraudulently won , with a fabricated 70% majority of the vote. Thus, they rapidly established themselves as the dominant political force. Gheorghe Gheorghiu-Dej , a communist party leader imprisoned in 1933, escaped in 1944 to become Romania's first communist leader. In February 1947, he and others forced King Michael I to abdicate and leave

13770-648: The principal sector of economy, but several branches of industry—especially the production of coal, oil, metals, synthetic rubber, explosives and cosmetics—developed during the interwar period . With oil production of 5.8 million tons in 1930, Romania ranked sixth in the world. Two parties, the National Liberal Party and the National Peasants' Party , dominated political life, but the Great Depression in Romania brought about significant changes in

13905-618: The provincials enjoyed a long period of peace and prosperity in the 2nd century. Scholars accepting the Daco-Roman continuity theory—one of the main theories about the origin of the Romanians —say that the cohabitation of the native Dacians and the Roman colonists in Roman Dacia was the first phase of the Romanians' ethnogenesis . The Carpians , Goths , and other neighbouring tribes made regular raids against Dacia from the 210s. The Romans could not resist, and Emperor Aurelian ordered

14040-523: The reign of Bogdan I around 1360. A local dynasty ruled the Despotate of Dobruja in the second half of the 14th century, but the Ottoman Empire took possession of the territory after 1388. Princes Mircea I and Vlad III of Wallachia , and Stephen III of Moldavia defended their countries' independence against the Ottomans. Most Wallachian and Moldavian princes paid

14175-457: The remainder heats the atmosphere. The Mercury , Gemini , and Apollo capsules splashed down in the sea. These capsules were designed to land at relatively low speeds with the help of a parachute. Soviet/Russian capsules for Soyuz make use of a big parachute and braking rockets to touch down on land. Spaceplanes like the Space Shuttle land like a glider . After a successful landing,

14310-426: The rendezvouses and dockings with space stations , and crewed spaceflights on scientific or tourist missions. Spaceflight can be achieved conventionally via multistage rockets , which provide the thrust to overcome the force of gravity and propel spacecraft onto suborbital trajectories . If the mission is orbital , the spacecraft usually separates the first stage and ignites the second stage , which propels

14445-403: The resignation of Romania's Prime Minister Victor Ponta. During 2017–2018, in response to measures which were perceived to weaken the fight against corruption, some of the biggest protests since 1989 took place in Romania, with over 500,000 people protesting across the country. Nevertheless, there have been significant reforms aimed at tackling corruption. A National Anticorruption Directorate

14580-459: The rivers Dniester and Dnieper) under Romanian administration. Romanian and German troops massacred at least 160,000 local Jews in these territories; more than 105,000 Jews and about 11,000 Gypsies died during their deportation from Bessarabia to Transnistria. Most of the Jewish population of Moldavia, Wallachia, Banat and Southern Transylvania survived, but their fundamental rights were limited. After

14715-734: The same regions. The reliability of the Gesta is debated. Some scholars regard it as a basically accurate account, others describe it as a literary work filled with invented details. The Pechenegs seized the lowlands abandoned by the Hungarians to the east of the Carpathians. Byzantine missionaries proselytised in the lands east of the Tisa from the 940s and Byzantine troops occupied Dobruja in the 970s. The first king of Hungary , Stephen I , who supported Western European missionaries, defeated

14850-546: The separate status of Transylvania in the Habsburg Monarchy, but the Austro-Hungarian Compromise brought about the union of the province with Hungary in 1867. Ethnic Romanian politicians sharply opposed the Hungarian government's attempts to transform Hungary into a national state, especially the laws prescribing the obligatory teaching of Hungarian. Leaders of the Romanian National Party proposed

14985-463: The size of the rocket relative to the payload is similar to an Intercontinental Ballistic Missile (ICBM). Any intercontinental spaceflight has to surmount problems of heating during atmospheric re-entry that are nearly as large as those faced by orbital spaceflight. A minimal orbital spaceflight requires much higher velocities than a minimal sub-orbital flight, and so it is technologically much more challenging to achieve. To achieve orbital spaceflight,

15120-640: The space services division of Alcatel . Creation of the joint venture was concurrent with the creation of Alcatel Alenia Space (now Thales Alenia Space), formed by the merger of two other Alcatel and Finmeccanica (since 2016 rebranded Leonardo-Finmeccanica) space businesses (Alcatel Space and Alenia Spazio respectively). During 2007, the European Commission (EC) approved the transfer to Thales of Alcatel's interests in joint ventures Alcatel Alenia Space (Thales: 67%; Finmeccanica: 33%) and Telespazio (Finmeccanica: 67%; Thales: 33%); this restructuring resulted in

15255-431: The spacecraft to high enough speeds that it reaches orbit. Once in orbit, spacecraft are at high enough speeds that they fall around the Earth rather than fall back to the surface. Most spacecraft, and all crewed spacecraft, are designed to deorbit themselves or, in the case of uncrewed spacecraft in high-energy orbits, to boost themselves into graveyard orbits . Used upper stages or failed spacecraft, however, often lack

15390-636: The spacecraft, its occupants, and cargo can be recovered. In some cases, recovery has occurred before landing: while a spacecraft is still descending on its parachute, it can be snagged by a specially designed aircraft. This mid-air retrieval technique was used to recover the film canisters from the Corona spy satellites. Uncrewed spacecraft or robotic spacecraft are spacecraft without people on board. Uncrewed spacecraft may have varying levels of autonomy from human input, such as remote control , or remote guidance. They may also be autonomous , in which they have

15525-749: The steppes north of the Lower Danube in the 830s, but the Bulgarians and the Pechenegs jointly forced them to abandon this region for the lowlands along the Middle Danube around 894. Centuries later, the Gesta Hungarorum wrote of the invading Magyars' wars against three dukes— Glad , Menumorut and the Vlach Gelou —for Banat, Crișana and Transylvania. The Gesta also listed many peoples—Slavs, Bulgarians, Vlachs, Khazars , and Székelys —inhabiting

15660-407: The sultan's right to confirm the election of the princes. Mihail Kogălniceanu , Nicolae Bălcescu and other leaders of the 1848 revolutions in Moldavia and Wallachia demanded the emancipation of the peasants and the union of the two principalities, but Russian and Ottoman troops crushed their revolt. The Wallachian revolutionists were the first to adopt the blue, yellow and red tricolour as

15795-610: The tangential velocity around the Earth is as important as altitude. In order to perform a stable and lasting flight in space, the spacecraft must reach the minimal orbital speed required for a closed orbit . Interplanetary spaceflight is flight between planets within a single planetary system . In practice, the use of the term is confined to travel between the planets of our Solar System . Plans for future crewed interplanetary spaceflight missions often include final vehicle assembly in Earth orbit, such as NASA's Constellation program and Russia's Kliper / Parom tandem. New Horizons

15930-559: The territory of modern Romania began in the Lower Paleolithic , later becoming the kingdom of Dacia before Roman conquest and Romanisation . The modern Romanian state emerged in 1859 through the union of Moldavia and Wallachia and gained independence from the Ottoman Empire in 1877. During World War I , Romania joined the Allies , and after the war, territories including Transylvania and Bukovina were integrated into Romania. In World War II , Romania initially aligned with

16065-411: The total amount of energy imparted by a rocket stage to its payload. This can be the energy imparted by a first stage of a launch vehicle to an upper stage plus payload, or by an upper stage or spacecraft kick motor to a spacecraft . In order to reach a space station , a spacecraft would have to arrive at the same orbit and approach to a very close distance (e.g. within visual contact). This

16200-460: The use of some new, advanced method of propulsion . Dynamic soaring as a way to travel across interstellar space has been proposed as well. Intergalactic travel involves spaceflight between galaxies, and is considered much more technologically demanding than even interstellar travel and, by current engineering terms, is considered science fiction . However, theoretically speaking, there is nothing to conclusively indicate that intergalactic travel

16335-413: The vehicle is to land safely without vaporizing in the atmosphere. Typically this process requires special methods to protect against aerodynamic heating . The theory behind reentry was developed by Harry Julian Allen . Based on this theory, reentry vehicles present blunt shapes to the atmosphere for reentry. Blunt shapes mean that less than 1% of the kinetic energy ends up as heat reaching the vehicle, and

16470-456: The vehicle's mass and increase its delta-v . Launch systems are used to carry a payload from Earth's surface into outer space. Most current spaceflight uses multi-stage expendable launch systems to reach space. The first reusable spacecraft, the X-15 , was air-launched on a suborbital trajectory on 19 July 1963. The first partially reusable orbital spacecraft, the Space Shuttle , was launched by

16605-711: The violent Romanian Revolution of December 1989 in which thousands were killed or injured. After a trial, Ceaușescu and his wife were executed by firing squad at a military base outside Bucharest on 25 December 1989. The charges for which they were executed were, among others, genocide by starvation. After the 1989 revolution, the National Salvation Front (FSN), led by Ion Iliescu , took partial and superficial multi-party democratic and free market measures after seizing power as an ad interim governing body. In March 1990, violent outbreaks went on in Târgu Mureș as

16740-632: The war against the Central Powers in 1916. The German and Austrian-Hungarian troops defeated the Romanian army and occupied three-quarters of the country by early 1917. After the October Revolution turned Russia from an ally into an enemy, Romania was forced to sign a harsh peace treaty with the Central Powers in May 1918, but the collapse of Russia also enabled the union of Bessarabia with Romania . King Ferdinand again mobilised

16875-554: The war, bringing about a rapprochement between Romania and the Triple Entente of France, Russia and the United Kingdom. The country remained neutral when World War I broke out in 1914, but Prime Minister Ion I. C. Brătianu started negotiations with the Entente Powers. After they promised Austrian-Hungarian territories with a majority of ethnic Romanian population to Romania in the Treaty of Bucharest , Romania entered

17010-453: Was Sputnik , launched October 4, 1957 to orbit the Earth. Nearly all satellites , landers and rovers are robotic spacecraft. Not every uncrewed spacecraft is a robotic spacecraft; for example, a reflector ball is a non-robotic uncrewed spacecraft. Space missions where other animals but no humans are on-board are called uncrewed missions. The first human spaceflight was Vostok 1 on April 12, 1961, on which cosmonaut Yuri Gagarin of

17145-480: Was NASA's first space probe intended to reach the Moon. A partial failure caused it to instead follow a suborbital trajectory to an altitude of 113,854 kilometers (70,746 mi) before reentering the Earth's atmosphere 43 hours after launch. The most generally recognized boundary of space is the Kármán line 100 km (62 mi) above sea level. (NASA alternatively defines an astronaut as someone who has flown more than 80 km (50 mi) above sea level.) It

17280-481: Was again united under Decebalus around 85 AD. He resisted the Romans for decades, but the Roman army defeated his troops in 106 AD. Emperor Trajan transformed Banat , Oltenia , and the greater part of Transylvania into a new province called Roman Dacia , but Dacian and Sarmatian tribes continued to dominate the lands along the Roman frontiers. The Romans pursued an organised colonisation policy, and

17415-507: Was elected president, in 2000 Iliescu returned to power, while Traian Băsescu was elected in 2004 and narrowly re-elected in 2009. In 2009, the country was bailed out by the International Monetary Fund as an aftershock of the Great Recession in Europe . In November 2014, Sibiu former FDGR/DFDR mayor Klaus Iohannis was elected president, unexpectedly defeating former Prime Minister Victor Ponta , who had been previously leading in

17550-695: Was formed in the country in 2002, inspired by similar institutions in Belgium , Norway and Spain . Since 2014, Romania launched an anti-corruption effort that led to the prosecution of medium- and high-level political, judicial and administrative offenses by the National Anticorruption Directorate . After the end of the Cold War , Romania developed closer ties with Western Europe and the United States, eventually joining NATO in 2004, and hosting

17685-466: Was inaugurated between North America and Europe. In 1968, Intelsat and Telespazio signed an agreement to provide the first telemetry and remote control services on Intelsat satellites. During 1969, the firm played a role in distributing the live broadcast of the Apollo 11 Moon landing across Europe. During the 1970s, Telespazio experienced a period of expansion and diversification. During May 1974, it signed

17820-516: Was one of the most long-lasting and strongest in the Eastern Bloc. A 2006 commission estimated the number of direct victims of the Communist repression at two million people. In 1965, Nicolae Ceaușescu came to power and started to conduct the country's foreign policy more independently from the Soviet Union. Thus, communist Romania was the only Warsaw Pact country which refused to participate in

17955-657: Was published by Scottish astronomer and mathematician William Leitch , in an 1861 essay "A Journey Through Space". More well-known is Konstantin Tsiolkovsky 's work, " Исследование мировых пространств реактивными приборами " ( The Exploration of Cosmic Space by Means of Reaction Devices ), published in 1903. In his work, Tsiolkovsky describes the fundamental rocket equation: Δ v = v e ln ⁡ m 0 m f {\displaystyle \Delta v=v_{e}\ln {\frac {m_{0}}{m_{f}}}} Where: This equation, known as

18090-709: Was the Columbia , followed by the Challenger , Discovery , Atlantis , and Endeavour . The Endeavour was built to replace the Challenger , which was lost in January 1986. The Columbia broke up during reentry in February 2003. Romania – in Europe  (green & dark grey) – in the European Union  (green) Romania is a country located at

18225-553: Was the first Dacian ruler to unite the local tribes. He also conquered the Greek colonies in Dobruja and the neighbouring peoples as far as the Middle Danube and the Balkan Mountains between around 55 and 44 BC. After Burebista was murdered in 44 BC, his kingdom collapsed. The Romans reached Dacia during Burebista's reign and conquered Dobruja in 46 AD. Dacia

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