What makes Mark and Scott Kelly unique in space history?
Oldest astronauts
First twins in space
Only twin astronauts
Longest spacewalk
Answer
Only twin astronauts, Mark and Scott Kelly, made significant contributions to space exploration. Their identical genetic makeup offered a unique opportunity to study the effects of long-duration spaceflight on the human body and mind, allowing for valuable insights into human adaptation to space environments and opening doors for future space missions.
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