Two Key Things Astronaut Scott Kelly's Body Will Teach Us About Living in Space

Two Key Things Astronaut Scott Kelly's Body Will Teach Us About Living in Space
Image Credit: NASA

We’re all looking forward to interstellar travel and colonizing Mars, but first, we’ve got a lot to learn about how the human body responds to the cold dark void of outer space. Scott Kelly’s stint on the ISS, which ends tomorrow, is helping us answer some critical questions—including what weightlessness does to our vision, and whether all that extra radiation messes up our DNA.

When Kelly lands at the Baikonur Cosmodrome in Kashakstan tomorrow night, he’ll have spent 340 consecutive days in space—an American record. That’s about as long as astronauts will have to spend on a spacecraft to travel to Mars and back. Kelly’s graciously-donated body has thus offered NASA an invaluable opportunity to understand what our future Martian explorers will…

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