NASA compared twin astronauts to see if space ages the human body

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TL;DR

NASA discovered that the telomeres of the Kelly brother who was in space got longer. Scientists thinks the study sheds light on how the human body can adapt and recover from the dramatic toll of spaceflight. The research can also help us understand how the human body reacts to other stressors such as disease. The study will help scientists better understand the changes astronauts undergo during long term space travel crucial knowledge as NASA contemplates human expeditions to the Moon and Mars. Researchers identified five possible causes for the genetic changes including space radiation and the weightlessness of a zero gravity environment. The space station where Scott Kelly lived orbits below the Van Allen radiation belt a shell of energetic charged particles built up outside Earths protective magnetic field

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