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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.

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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)