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on the Human Exploration of Space
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Established 1982
Incorporation 2003
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Gemini 4

By the summer of 1965 only one American astronaut had spent more than a day in space compared to four Soviet cosmonauts. With Apollo lunar flight planned to last at between one and two weeks NASA had to start exploring the challenge of longer duration spaceflight to understanding the medical hurdles and address the problems of endurance missions on equipment and systems. Therefore, across just six months in 1965, three Gemini missions, starting with Gemini 4, would gradually increase mission duration to four, then eight and ultimately fourteen days.
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