History of spaceflight

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The number of spacewalks required to construct the ISS dwarfed the then existing experience base for this activity, a hurdle called the "Wall of EVA."[1]


Orbital human spaceflight
Program Years Flights
Vostok 1961-1963 6
Mercury 1962-1963 4[a]
Voskhod 1964-1965 2
Gemini 1965-1966 10
Soyuz 1967-present 137[b]
Apollo 1968-1972 11[c]
Skylab 1973-1974 3
Apollo-Soyuz 1975 1[d]
Space Shuttle 1981-2011 135[e]
Shenzhou 2003-present 6
Suborbital human spaceflight
Program Year Flights
Mercury 1961 2
X-15 1963 2
Soyuz 18a 1975 1
SpaceShipOne 2004 3

Spaceflight began in the 20th century following theoretical and practical breakthroughs by Konstantin Tsiolkovsky and Robert H. Goddard. The Soviet Union took the lead in the post-war Space Race, launching the first satellite, the first man and the first woman into orbit. The United States caught up with, and then passed, their Soviet rivals during the mid-1960s, landing the first man on the Moon in 1969. In the same period, France, the United Kingdom, Japan and China were concurrently developing more limited launch capabilities.

Following the end of the Space Race, spaceflight has been characterised by greater international co-operation, cheaper access to low Earth orbit and an expansion of commercial ventures. Interplanetary probes have visited all of the planets in the Solar System, and humans have remained in orbit for long periods aboard space stations such as Mir and the ISS. Most recently, China has emerged as the third nation with the capability to launch independent manned missions, whilst operators in the commercial sector have developed re-usable booster systems and craft launched from airborne platforms.

Background[edit]

Description of a space station in Hermann Noordung's The Problem of Space Travel (1929).

At the beginning of the 20th century, there was a burst of scientific investigation into interplanetary travel, inspired by fiction by writers such as Jules Verne (From the Earth to the Moon, Around the Moon) and H.G. Wells (The First Men in the Moon, The War of the Worlds).

The first realistic proposal of spaceflight goes back to Konstantin Tsiolkovsky. His most famous work, "Исследование мировых пространств реактивными приборами" (Issledovanie mirovikh prostranstv reaktivnimi priborami, or The Exploration of Cosmic Space by Means of Reaction Devices), was published in 1903, but this theoretical work was not widely influential outside Russia.[2]

Spaceflight became an engineering possibility with the work of Robert H. Goddard's publication in 1919 of his paper "A Method of Reaching Extreme Altitudes", where his application of the de Laval nozzle to liquid fuel rockets gave sufficient power for interplanetary travel to become possible. This paper was highly influential on Hermann Oberth and Wernher Von Braun, later key players in spaceflight.

In 1929, the Slovene officer Hermann Noordung was the first to imagine a complete space station in his book The Problem of Space Travel.[3][4]

The first rocket to reach space was a German V-2 rocket, on a vertical test flight in June 1944.[5] After the war ended, the research and development branch of the (British) Ordinance Office organised Operation Backfire which, in October 1945, assembled enough V-2 missiles and supporting components to enable the launch of three (possibly four, depending on source consulted) of them from a site near Cuxhaven in northern Germany. Although these launches were inclined and the rockets didn't achieve the altitude necessary to be regarded as sub-orbital spaceflight, the Backfire report remains the most extensive technical documentation of the rocket, including all support procedures, tailored vehicles and fuel composition.[6]

Subsequently, the British Interplanetary Society proposed an enlarged man-carrying version of the V-2 called Megaroc. The plan, written in 1946, envisaged a three-year development programme culminating in the launch of test pilot Eric Brown on a sub-orbital mission in 1949.[7][8]

The decision by the Ministry of Supply under Attlee's government to concentrate on research into nuclear power generation and sub-sonic passenger jet aircraft over supersonic atmospheric flight and spaceflight delayed the introduction of both of the latter (although only by a year in the case of supersonic flight, as the data from the Miles M.52 was handed to Bell Aircraft.

Space Race[edit]

Over a decade after the Megaroc proposal, true orbital space flight, both unmanned and manned, was developed by the Soviet Union and the United States during the Cold War, in a competition dubbed the Space Race.

First unmanned satellite[edit]

A replica of Sputnik 1 on display.

The race began in 1957, when both the US and the USSR made statements announcing they planned to launch artificial satellites during the 18 month long International Geophysical Year of July 1957 to December 1958. On July 29, 1957, the US announced a planned launch of the Vanguard by the spring of 1958, and on July 31, the USSR announced it would launch a satellite in the fall of 1957.

On October 4, 1957, the Soviet Union launched Sputnik 1, the first artificial satellite of Earth in the history of mankind.

On November 3, 1957, the Soviet Union launched the second satellite, Sputnik 2, and the first to carry a living animal, a dog named Laika. Sputnik 3 was launched on May 15, 1958, and carried a large array of instruments for geophysical research and provided data on pressure and composition of the upper atmosphere, concentration of charged particles, photons in cosmic rays, heavy nuclei in cosmic rays, magnetic and electrostatic fields, and meteoric particles.

After a series of failures with the program, the US succeeded with Explorer 1, which became the first US satellite in space, on February 1, 1958. This carried scientific instrumentation and detected the theorized Van Allen radiation belt.

The US public shock over Sputnik 1 became known as the Sputnik crisis. On July 29, 1958, the US Congress passed legislation turning the National Advisory Committee for Aeronautics (NACA) into the National Aeronautics and Space Administration (NASA) with responsibility for the nation's civilian space programs. In 1959, NASA began Project Mercury to launch single-man capsules into Earth orbit and chose a corps of seven astronauts introduced as the Mercury Seven.

First man in space[edit]

On April 12, 1961, the USSR opened the era of manned spaceflight, with the flight of the first cosmonaut (Russian name for space travelers), Yuri Gagarin. Gagarin's flight, part of the Soviet Vostok space exploration program, took 108 minutes and consisted of a single orbit of the Earth.

On August 7, 1961, Gherman Titov, another Soviet cosmonaut, became the second man in orbit during his Vostok 2 mission.

By June 16, 1962, the Union launched a total of six Vostok cosmonauts, two pairs of them flying concurrently, and accumulating a total of 260 cosmonaut-orbits and just over sixteen cosmonaut-days in space.

On May 5, 1961, the US launched its first suborbital Mercury astronaut, Alan Shepard, in the Freedom 7 capsule. The US public was becoming increasingly shocked and alarmed at the widening lead obtained by the USSR, so President John F. Kennedy announced on May 25 a plan to land a man on the moon by 1970, launching the three-man Apollo program.

On February 20, 1962, the US succeeded in launching the third manned orbital spaceflight in history, with John Glenn, the first US orbital astronaut, making three orbits during his Friendship 7 mission. By May 16, 1963, the US launched a total of six Project Mercury astronauts, logging a cumulative 34 Earth orbits, and 51 hours in space.

First woman in space[edit]

The first woman in space was former civilian parachutist Valentina Tereshkova, who entered orbit on June 16, 1963, aboard the Soviet mission Vostok 6. The chief Soviet spacecraft designer, Sergey Korolyov, conceived of the idea to recruit a female cosmonaut corps and launch two women concurrently on Vostok 5/6. However, his plan was changed to launch a male first in Vostok 5, followed shortly afterward by Tereshkova. Khrushchev personally spoke to Tereshkova by radio during her flight.[9]

On November 3, 1963, Tereshkova married fellow cosmonaut Andrian Nikolayev, who had previously flown on Vostok 3.[10] On June 8, 1964, she gave birth to the first child conceived by two space travelers.[11] The couple divorced in 1982, and Tereshkova went on to become a prominent member of the Communist Party of the Soviet Union.

The second woman to fly to space was aviator Svetlana Savitskaya, aboard Soyuz T-7 on August 18, 1982.[12]

Sally Ride became the first American woman in space when she flew aboard Space Shuttle mission STS-7 on June 18, 1983. Women space travelers went on to become commonplace during the 1980s.

Helen Sharman became the first European woman in space aboard the Soyuz TM-12 on May 18, 1991.[13]

Competition develops[edit]

Khrushchev pressured Korolyov to quickly produce greater space achievements in competition with the announced Gemini and Apollo plans. Rather than allowing him to develop his plans for a crewed Soyuz spacecraft, he was forced to make modifications to squeeze two or three men into the Vostok capsule, calling the result Voskhod. Only two of these were launched. Voskhod 1 was the first spacecraft with a crew of three, who could not wear space suits because of size and weight constrictions. Alexei Leonov made the first spacewalk when he left the Voskhod 2 on March 8, 1965. He was almost lost in space when he had extreme difficulty fitting his inflated space suit back into the cabin through an airlock, and a landing error forced him and his crewmate to be lost in dangerous woods for hours before being found by the recovery crew.

The start of manned Gemini missions was delayed a year later than NASA had planned, but ten largely successful missions were launched in 1965 and 1966, allowing the US to overtake the Soviet lead by achieving space rendezvous (Gemini 6A) and docking (Gemini 8) of two vehicles, long duration flights of eight days (Gemini 5) and fourteen days (Gemini 7), and demonstrating the use of extra-vehicular activity to do useful work outside a spacecraft (Gemini 12).

The USSR made no manned flights during this period but continued to develop its Soyuz craft and secretly accepted Kennedy's implicit lunar challenge, designing Soyuz variants for lunar orbit and landing. They also attempted to develop the N1, a large, manned moon-capable launch vehicle similar to the US Saturn V.

As both nations rushed to get their new spacecraft flying with men, the intensity of the competition caught up to them in early 1967, when they suffered their first crew fatalities. On January 27, the entire crew of Apollo 1, "Gus" Grissom, Ed White, and Roger Chaffee, were killed by suffocation in a fire that swept through their cabin during a ground test approximately one month before their planned launch. On April 24, the single pilot of Soyuz 1, Vladimir Komarov, was killed in a crash when his landing parachutes tangled, after a mission cut short by electrical and control system problems. Both accidents were determined to be caused by design defects in the spacecraft, which were corrected before manned flights resumed.

Neil Armstrong works at the LM in one of the few photos taken of him from the lunar surface. NASA photo AS11-40-5886.
Buzz Aldrin poses on the Moon, allowing Neil Armstrong to photograph both of them using the visor's reflection.

The US succeeded in achieving President Kennedy's goal on July 20, 1969, with the landing of Apollo 11. Neil Armstrong and Buzz Aldrin became the first men to set foot on the Moon. Six such successful landings were achieved through 1972, with one failure on Apollo 13.

The N1 rocket suffered four catastrophic unmanned launch failures between 1969 and 1972, and the Soviet government officially discontinued its manned lunar program on June 24, 1974, when Valentin Glushko succeeded Korolyov as General Spacecraft Designer.[14]

Both nations went on to fly relatively small, non-permanent manned space laboratories Salyut and Skylab, using their Soyuz and Apollo craft as shuttles. The US launched only one Skylab, but the USSR launched a total of seven "Salyuts", three of which were secretly Almaz military manned reconnaissance stations, which carried "defensive" cannons. Manned reconnaissance stations were found to be a bad idea since unmanned satellites could do the job much more cost-effectively. The United States Air Force had planned a manned reconnaissance station, the Manned Orbital Laboratory, which was cancelled in 1969. The Soviets cancelled Almaz in 1978.

In a season of detente, the two competitors declared an end to the race and shook hands (literally) on July 17, 1975, with the Apollo-Soyuz Test Project, where the two craft docked, and the crews exchanged visits.

Programs[edit]

United StatesNASA[edit]

The National Aeronautics and Space Administration (NASA /ˈnæsə/) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.[15]

Project Mercury[edit]

Project Mercury was the first human spaceflight program of the United States, running from 1958 through 1963. Its goal was to put a man into Earth orbit and return him safely, ideally before the Soviet Union. John Glenn became the first American to orbit the earth on February 20, 1962 aboard the Mercury-Atlas 6.[16]

Project Gemini[edit]

The Gemini VIII approaches the docking collar of the Agena target vehicle.

Project Gemini was NASA's second manned spaceflight program. The program ran from 1961 to 1966. The program pioneered the orbital maneuvers required for space rendezvous.[17] Ed White became the first American to make an extravehicular activity (EVA, or "space walk"), on June 3, 1965, during Gemini 4.[18] Gemini 6A and 7 accomplished the first space rendezvous on December 15, 1965.[19] Gemini 8 achieved the first space docking with an unmanned Agena Target Vehicle on March 16, 1966. Gemini 8 was also the first US spacecraft to experience in-space critical failure endangering the lives of the crew.[20]

Apollo Program[edit]

The Apollo program was the third manned spaceflight program carried out by NASA. The programs goal was to orbit and land manned vehicles on the moon.[21] The program ran from 1969 to 1972. Apollo 8 was the first manned spaceflight to leave earth orbit and orbit the Earth's moon on December 21, 1968.[22] Neil Armstrong and Buzz Aldrin became the first men to set foot on the moon during the Apollo 11 mission on July 20, 1969.[23]

Skylab[edit]

The Skylab programs goal was to create the first space station of NASA. The program marked the last launch of the Saturn V rocket on May 19, 1973. Many experiments were performed on board, including unprecedented solar studies.[24] The longest manned mission of the program was Skylab 4 which lasted 84 days, from November 16, 1973 to February 8, 1974.[25] The total mission duration was 2249 days, with Skylab finally falling from orbit over Australia on July 11, 1979.[26]

Space Shuttle[edit]

Space Shuttle Columbia seconds after engine ignition during STS-1, 1981.

Although its pace slowed, space exploration continued after the end of the Space Race. The United States launched the first reusable spacecraft, the Space Shuttle, on the 20th anniversary of Gagarin's flight, April 12, 1981. On November 15, 1988, the Soviet Union duplicated this with an unmanned flight of the only Buran-class shuttle to fly, its first and only reusable spacecraft. It was never used again after the first flight; instead the Soviet Union continued to develop space stations using the Soyuz craft as the crew shuttle.

Sally Ride became the first American woman in space in 1983. Eileen Collins was the first female Shuttle pilot, and with Shuttle mission STS-93 in July 1999 she became the first woman to command a US spacecraft.

The United States continued missions to the ISS and other goals with the high-cost shuttle system, which was retired in 2011.

Soviet UnionSoviet space program[edit]

The Soviet space program was the rocketry and space exploration program conducted by the Soviet Union from the 1930s till its collapse in 1991.

Sputnik[edit]

The Sputnik 1 became the first artificial Earth satellite on 4 October 1957. The satellite transmitted a radio signal, but had no sensors otherwise.[27] Studying the Sputnik 1 allowed scientists to calculate the drag from the upper atmosphere by measuring position and speed of the satellite.[28] Sputnik 1 broadcast for 21 days until its batteries depleted on 4 October 1957, and the satellite finally fell from orbit on 4 January 1958.[29]

Luna programme[edit]

The Luna programme was a series of unmanned robotic satellite launches with the goal of studying the moon.The program ran from 1959 to 1976 and consisted of 15 successful missions, the program achieved many first achievements and collected data on the Moon's chemical composition, gravity, temperature, and radiation. Luna 2 became the first man made object to make contact with the moons surface in September 1959.[30] Luna 3 returned the first photographs of the far side of the moon in October 1959.[31]

Vostok[edit]

Vostok-2M (8A292M) in Korolyov, Moscow Oblast

The Vostok Programme the first Soviet spaceflight project to put the Soviet citizens into low Earth orbit and return them safely. The programme carried out six manned spaceflights between 1961 and 1963. The program was the first program to put humans into space, with Yuri Gagarin becoming the first man in space on April 12, 1961 aboard the Vostok 1.[32] Gherman Titov Became the first person to stay in orbit for a full day on August 7, 1961 aboard the vostok 2.[33] Valentina Tereshkova became the first woman in space on June 16, 1963 aboard the vostok 6.[34]

Voskhod[edit]

The Voskhod programme began in 1964 and consisted of two manned flights before the program was canceled by the Soyuz programme in 1966. Voskhod 1 launched on October 12, 1964 and was the first manned spaceflight with a multi-crewed vehicle.[35] Alexey Leonov performed the first spacewalk aboard Voskhod 2 on March 18, 1965.[36]

Salyut[edit]

The Salyut programme was the first space station program undertaken by the Soviet Union.[37] The goal was to carry out long-term research into the problems of living in space and a variety of astronomical, biological and Earth-resources experiments. The program ran from 1971 to 1986. Salyut 1, the first station in the program, became the world's first crewed space station.[38]

Soyuz programme[edit]

The Soyuz programme was initiated by the soviet space program in the 1960s and continues as the responsibility of roscosmos to this day. The program currently consists of 140 completed flights, and since the retirement of the US Space Shuttle has been the only craft to transport humans. The programs original goal was part of a program to put a cosmonaut on the moon, and later became crucial to the construction of the Mir space station.

Mir[edit]

Mir STS-89

Mir was a space station that operated in low Earth orbit from 1986 to 2001, operated by the Soviet Union and later by Russia. Mir was the first modular space station and was assembled in orbit from 1986 to 1996. The station served as a microgravity research laboratory in which crews conducted experiments in biology, human biology, physics, astronomy, meteorology and spacecraft systems with a goal of developing technologies required for permanent occupation of space.[39] The record for longest human endurance on a single tour in space is held by Valeriy Polyakov, who left Earth on January 8, 1994, and stayed aboard the Mir space station for a total of 437 days, 17 hours, 58 minutes, and 16 seconds, returning March 22, 1995. Sergei Krikalyov holds the current record for combined total time in space: 803 days, 9 hours, and 39 seconds. Mir was continuously occupied for 3,644 days, eight days short of 10 years, between the launch of Soyuz TM-8 on September 5, 1989 and the landing of Soyuz TM-29 on August 28, 1999. This record was held until surpassed by the International Space Station (ISS) in 2010. The ISS has been continuously occupied for 6554 days.

Buran[edit]

The Buran Programme was a Soviet and later Russian reusable spacecraft project that began in 1974 at the Central Aerohydrodynamic Institute in Moscow and was formally suspended in 1993.[40] The Buran programme was started by the Soviet Union as a response to the United States Space Shuttle program.[41] Officially, the Buran orbital vehicle was designed for the delivery to orbit and return to Earth of spacecraft, cosmonauts, and supplies.[42]

United StatesRussiaJapanEuropean UnionCanada International Space Station[edit]

The ISS seen by Space Shuttle Atlantis.

Recent space exploration has proceeded, to some extent in worldwide cooperation, the high point of which was the construction and operation of the International Space Station (ISS). At the same time, the international space race between smaller space powers since the end of the 20th century can be considered the foundation and expansion of markets of commercial rocket launches and space tourism.

The United States continued other space exploration, including major participation with the ISS with its own modules. It also planned a set of unmanned Mars probes, military satellites, and more. The Constellation space program, began by President George W. Bush in 2004, aimed to launch a next-generation multifunction Orion spacecraft by 2018. A subsequent return to the Moon by 2020 was to be followed by manned flights to Mars, but the program was canceled in 2010 in favor of encouraging commercial US manned launch capabilities.

Russia, a successor to the Soviet Union, has high potential but smaller funding. Its own space programs, some of a military nature, perform several functions. They offer a wide commercial launch service while continuing to support the ISS with several of their own modules. They also operate manned and cargo spacecraft which continued after the US Shuttle program ended. They are developing a new multi-function PPTS manned spacecraft for use in 2018 and have plans to perform manned moon missions as well. The program aims to put a man on the moon in the 2020s, becoming the second country to do so.

European Union European Space Agency[edit]

The European Space Agency has taken the lead in commercial unmanned launches since the introduction of the Ariane 4 in 1988 but is in competition with NASA, Russia, Sea Launch (private), China, India, and others. The ESA-designed manned shuttle Hermes and space station Columbus were under development in the late 1980s in Europe; however, these projects were canceled, and Europe did not become the third major "space power".

The European Space Agency has launched various satellites, has utilized the manned Spacelab module aboard US shuttles, and has sent probes to comets and Mars. It also participates in ISS with its own module and the unmanned cargo spacecraft ATV.

Currently ESA has a program for development of an independent multi-function manned spacecraft CSTS scheduled for completion in 2018. Further goals include an ambitious plan called the Aurora Programme, which intends to send a human mission to Mars soon after 2030. A set of various landmark missions to reach this goal are currently under consideration. The ESA has a multi-lateral partnership and plans for spacecraft and further missions with foreign participation and co-funding. ESA is also developing Galileo program which seeks to give independence to the EU from the American GPS.

China China[edit]

Since 1956 the Chinese have had a space program which was aided early on from 1957-1960 by the Soviets. They were provided missile technology experts and missiles to study from. In 1965 plans were made to launch a human into space by 1979, and in 1967 the plans were made for a 4-human spacecraft. "East is Red" was launched on April 24, 1970 and was the first satellite to be launched by the Chinese. In 1974 the plan for human spaceflight was scrapped when policy makers decided that applications satellites were more important and competing with the USA and USSR wasn't as important. In late 1986, the 863 Project was started which had a focus on military applications, but also had a goal for human spaceflight.[43]

Despite possessing less funding than ESA or NASA, the People's Republic of China has achieved manned space flight and operates a commercial satellite launch service. There are plans for a Chinese space station and a program to send unmanned probes to Mars.

China's first attempt at a manned spacecraft, Shuguang, was abandoned after years of development, but on October 15, 2003, China became the third nation to develop an indigenous human spaceflight capability when Yang Liwei entered orbit aboard Shenzhou 5.

The US Pentagon released a report in 2006, detailing concerns about China's growing presence in space, including its capability for military action.[44] In 2007 China tested a ballistic missile designed to destroy satellites in orbit, which was followed by a US demonstration of a similar capability in 2008.

Japan Japan[edit]

Japan's space agency, the Japan Aerospace Exploration Agency, is a major space player in Asia. While not maintaining a commercial launch service, Japan has deployed a module in the ISS and operates an unmanned cargo spacecraft, the H-II Transfer Vehicle.

JAXA has plans to launch a Mars fly-by probe. Their lunar probe, SELENE, is touted as the most sophisticated lunar exploration mission in the post-Apollo era. Japan's Hayabusa probe was mankind's first sample return from an asteroid. IKAROS was the first operational solar sail.

Although Japan developed the HOPE-X, Kankoh-maru, and Fuji manned capsule spacecraft, none of them have been launched. Japan's current ambition is to deploy a new manned spacecraft by 2025 and to establish a Moon base by 2030.

Taiwan Taiwan[edit]

The National Space Organization (NSPO; formerly known as the National Space Program Office) and the National Chung-Shan Institute of Science and Technology are the national civilian space agencies of the democratic industrialized developed country of Taiwan under the auspices of the Ministry of Science and Technology (Taiwan). The National Chung-Shan Institute of Science and Technology is involved in designing and building Taiwanese nuclear weapons, [45][46][47][48] hypersonic missiles, spacecraft and rockets for launching satellites while the National Space Organization is involved in space exploration, satellite construction, and satellite development as well as related technologies and infrastructure (including the FORMOSAT series of Earth observation satellites similar to NASA[49] along with DARPA {In-Q-Tel} such as Google Earth {Keyhole, Inc} or so forth) and related research in astronautics, quantum physics, materials science with microgravity, aerospace engineering, remote sensing, astrophysics, atmospheric science, information science, design and construction of indigenous Taiwanese satellites and spacecraft, launching satellites and space probes into low Earth orbit.[50][51][52] Additionally, a state of the art manned spaceflight program is currently in development in Taiwan and is designed to compete directly with the manned programs of China, United States and Russia. Active research is currently undergoing in the development and deployment of space-based weapons for the defense of national security in Taiwan.[53]

India India[edit]

Indian Space Research Organisation, India's national space agency, maintains an active space program. It operates a small commercial launch service and launched a successful unmanned lunar mission dubbed Chandrayaan-1 in October 2007. India has plans for a further unmanned mission to the Moon Chandrayaan 2 by end of 2016 or early 2017. India has successfully launched an interplanetary mission, Mars Orbiter Mission, in 2013 which reached Mars in September 2014, hence becoming the first country in the world to do a Mars mission in its maiden attempt. The ISRO is currently developing a small shuttle system.

Other nations[edit]

Cosmonauts and astronauts from other nations have flown in space, beginning with the flight of Vladimir Remek, a Czech, on a Soviet spacecraft on March 2, 1978. As of November 6, 2013, a total of 536 people from 38 countries have gone into space according to the FAI guideline.

India, Taiwan and Japan are increasingly capable of competing in space research and activity. These nations, along with China, form the main players in the Asian space race. Iran announced plans[when?] to begin a manned space program in 2021.[citation needed]

See also[edit]

Notes[edit]

  1. ^ Project Mercury's first two flights were suborbital flights (listed below), while its latter four flights were orbital flights.
  2. ^ Includes several special cases. Soyuz 1 and Soyuz 11 were both fatal missions which reached space. Soyuz 19 was the Soviet participant in the Apollo-Soyuz Test Project, a separate craft from the American Apollo craft which is listed below. Soyuz 32 brought a crew to the Salyut 6 space station, but the crew returned on Soyuz 34, which had been sent to the station without a crew. Soyuz T-10a was an aborted launch attempt which failed to reach space. As orbital flights or committed attempts, all of the above are included in the number. The one crewed Soyuz flight not included in this number is Soyuz 18a, an aborted mission which nevertheless reached space as a suborbital flight, and which is therefore listed separately below.
  3. ^ Does not include Apollo 1.
  4. ^ Represents the American Apollo craft. The Soviet craft, Soyuz 19, is counted in the above Soyuz number.
  5. ^ Includes two fatal missions: STS-51-L, and STS-107. The former did not reach space, while the latter did.

References[edit]

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  11. ^ Gatland (1976), p. 129
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Further reading[edit]

Media related to History of spaceflight at Wikimedia Commons