History of spaceflight
began in the 20th century following theoretical and practical breakthroughs by Konstantin Tsiolkovsky, Robert H. Goddard, and Hermann Oberth, each of whom published works proposing rockets as the means for spaceflight. The first successful large-scale rocket programs were initiated in Nazi Germany by Wernher von Braun. The Soviet Union took the lead in the post-war Space Race, launching the first satellite, the first animal, the first human and the first woman into orbit. The United States landed the first men on the Moon in 1969. Through the late 20th century, France, the United Kingdom, Japan, and China were also working on projects to reach space.
Following the end of the Space Race, spaceflight has been characterized by greater international cooperation, 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 crewed missions, while operators in the commercial sector have developed reusable booster systems and craft launched from airborne platforms. In 2020, SpaceX became the first commercial operator to successfully launch a crewed mission to the International Space Station with Crew Dragon Demo-2.
Background
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 and H.G. Wells.The first realistic proposal for spaceflight was "Issledovanie Mirovikh Prostranstv Reaktivnimi Priborami", or "The Exploration of Cosmic Space by Means of Reaction Devices" by Konstantin Tsiolkovsky, published in 1903.
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.
File:Bundesarchiv Bild 141-1880, Peenemünde, Start einer V2.jpg|thumb|left|upright|The German V-2 rocket, co-designed by Wernher von Braun, became the first man-made object to reach space.
The first rocket to reach space was the German V-2 rocket MW 18014, on a vertical test flight in June 1944. After the war ended, the research and development branch of the Ordinance Office organised Operation Backfire which, in October 1945, assembled enough V-2 missiles and supporting components to enable the launch of three of them from a site near Cuxhaven in northern Germany. Although these launches were inclined and the rockets did not 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.
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. The decision by the Ministry of Supply under Attlee's government to concentrate on nuclear power generation and sub-sonic passenger jet aircraft delayed the UK's space research.
In 1947, the US sent the first animals in space, fruit flies, although not into orbit, through a V-2 rocket launched from White Sands Missile Range, New Mexico. On June 14, 1949, the US launched the first mammal into space, a rhesus macaque monkey named Albert II, on a sub-orbital flight, though Albert II died when the parachute failed. On July 22, 1951, the Soviets launched the Soviet space dogs, Dezik and Tsygan, who were the first dogs in space and the first to safely return.
Establishment and Space Race
First artificial satellites
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 humankind.
On November 3, 1957, the Soviet Union launched the second satellite, Sputnik 2, and the first to carry a living animal into orbit, 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 into the National Aeronautics and Space Administration 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
On April 12, 1961, the USSR opened the era of crewed spaceflight, with the flight of the first cosmonaut, 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. Titov orbited Earth 17 times in over 25 hours during his spaceflight.
By June 16, 1963, the USSR 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.
First woman in space
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. The then first secretary of the Soviet Union, Nikita Khrushchev, spoke to Tereshkova by radio during her flight.On November 3, 1963, Tereshkova married fellow cosmonaut Andrian Nikolayev, who had previously flown on Vostok 3. On June 8, 1964, she gave birth to the first child conceived by two space travelers. 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.
Competition develops
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 Voskhod 2 crewmate Pavel Belyayev to be lost in dense woods for hours before being found by the recovery crew and rescued days later.The start of crewed 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 and docking of two vehicles, long duration flights of eight days and fourteen days, and demonstrating the use of extra-vehicular activity to do useful work outside a spacecraft.
The USSR made no crewed 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, crewed 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 crewed flights resumed.