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Spaceflight is the movement of spacecraft into and through outer space, primarily using rocket technology for propulsion. Spaceflight is used in space exploration, the endeavour to reach, explore, and exploit the space outside the Earth's atmosphere, and also in commercial activities like space tourism and satellite telecommunications. It is generally based on the use of rockets to transport machines, animals, and humans to, and subsequently through, space. Additional non-commercial uses of spaceflight include space observatories, reconnaissance satellites and other earth observation satellites. Objects launched into space may follow a sub-orbital trajectory and return to Earth immediately, stay in orbit around Earth, travel in the space between the planets, or aim to leave the space dominated by the Sun completely.
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Project Gemini was NASA's second human spaceflight program. It was a United States space program started in 1961 and concluded in 1966. Project Gemini was conducted between projects Mercury and Apollo. The Gemini spacecraft carried a two-astronaut crew. Ten crews flew low Earth orbit (LEO) missions between 1965 and 1966. It put the United States in the lead during the Cold War Space Race with the Soviet Union.
Its objective was to develop space travel techniques to support Apollo's mission to land astronauts on the Moon. Gemini achieved missions long enough for a trip to the Moon and back, perfected working outside the spacecraft with extra-vehicular activity (EVA), and pioneered the orbital maneuvers necessary to achieve space rendezvous and docking. With these new techniques proven in Gemini, Apollo could pursue its prime mission without doing these fundamental exploratory operations.
The astronaut corps that supported Project Gemini included the "Mercury Seven", "The New Nine", and the 1963 astronaut class. During the program, three astronauts died in air crashes during training, including the prime crew for Gemini 9. This mission was performed by the backup crew, the only time that had happened in NASA's history to that date.
John Watts Young (born September 24, 1930) is a retired American astronaut, naval officer and aviator, test pilot, and aeronautical engineer, who became the ninth person to walk on the Moon as Commander of the Apollo 16 mission in 1972.
Young enjoyed the longest career of any astronaut, becoming the first person to make six space flights over the course of 42 years of active NASA service, and is the only person to have piloted, and been commander of, four different classes of spacecraft: Gemini, the Apollo Command/Service Module, the Apollo Lunar Module, and the Space Shuttle.
In 1965, Young flew on the first manned Gemini mission, and commanded another Gemini mission the next year. In 1969, he became the first person to orbit the Moon alone during Apollo 10. He drove the Lunar Roving Vehicle on the Moon's surface during Apollo 16, and is one of only three people to have flown to the Moon twice. He also commanded two Space Shuttle flights, including its first launch in 1981, and served as Chief of the Astronaut Office from 1974-1987. Young retired from NASA in 2004.
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Astrodynamics • Human spaceflight • ISS • Orbit • Outer space • Robotic spacecraft • Rocket • Satellite • Space exploration • Spaceflight • Timeline of spaceflight
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