A 'Herculean' Study of Scott and Mark Kelly Asks: Are Humans Fit for Space?

Scientists around the world compared the genomes and health changes of twin astronauts. Scott Kelly (left) flew in the International Space Station for a year while Mark Kelly stayed on Earth.

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Scientists around the world compared the genomes and health changes of twin astronauts. Scott Kelly (left) flew in the International Space Station for a year while Mark Kelly stayed on Earth.

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