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What Does NASA's Twins Study Mean for the Future of Humans in Space?

From digestion to the rate we age, life in space could have surprising side effects.


We Might Age More Slowly in Space

NSA twins study Scott Kelly Mikhail Kornienko Year in Space ISSS
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  • Scott Kelly and Russian cosmonaut Mikhail Kornienko on their 300th consecutive day in space aboard the ISS.

    Photo Credit: NASA

Our Speed and Accuracy Could Decrease

NASA Twins Study ISS Scott Kelly spacewalk
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  • Scott Kelly on a Dec. 21, 2015 spacewalk.

    Photo Credit: NASA

Our Bones Might Not Form as Quickly

NASA twins study Scott Kelly Year In Space ISS.
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  • Scott Kelly during his Year in Space aboard the ISS, with a view of Earth in the foreground.

    Photo Credit: NASA

Our Digestion Is Different in Space

NASA twins study scott kelly ISS year in space
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  • Scott Kelly with some citrus fruits on the ISS during the Year in Space.

    Photo Credit: NASA

There Might Be a Space Gene

NASA twins study Scott Kelly Mark Kelly
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  • Brothers Mark Kelly (with mustache) and Scott Kelly.

    Photo Credit: NASA Johnson/Flickr (CC)