Astronaut Will Return After an Entire Year in Space

Scott Kelly has spent an entire year in space.

Astronaut Scott Kelly will be back on earth today after a year in space.

Kelly and a Russian Cosmonaut served as test subjects on the International Space Station, so scientists could study the affects of space travel on the human body.

It's all part of NASA's goal to make sure astronauts can handle a trip to Mars.

Scott Kelly will return to earth today and then to Texas tomorrow.

He's spent the most cumulative time in space of any American in history.

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