Gemini Revisited: Twins In Space

Scott Kelly and Mark Kelly

A pair of identical twins, NASA astronauts Scott and Mark Kelly, are to be the “guinea pigs” in research on how long-term space trips affect the human body. Both have served on Mir and the International Space Station and Scott is now scheduled to stay in orbit for a year. The purpose of the investigation is to learn how a crew can better cope with weightless during a trip to Mars.

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