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Hi, I'm Hannah Martin.

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And I'm Emily Martin.

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With more science news you can use.

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Did you know astronauts' bodies change in space?

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Well, my body always changes on Earth.

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Right, but in space, changes are more dramatic.

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For example, body fluids move from your lower body to your upper body,

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so astronauts' faces look puffy.

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Really? What else happens?

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Astronauts grow about one to two inches in space

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because fluids also move into the spaces between the bones and the spine,

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which makes it lengthen.

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Wow, I would be as tall as you are.

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Astronauts exercise one to two hours a day in space.

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This keeps their heart and muscles strong because they don't work as hard when they float.

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What about the brain? Does it change too?

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To find out how the brain and body adapt to these changes,

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check out our website.

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Until next time, I'm Hannah Martin.

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And I'm Emily Martin.

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With cool science news you can use.

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NASA Jet Propulsion Laboratory, California Institute of Technology