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Scott Kelly

What happens when one twin goes to space and the other stays on Earth? Study explores effects of space travel.

What happens when one twin goes to space and the other stays on Earth? Study explores effects of space travel.

Weight loss, altered eye shape and elongated DNA structures are just a few of the side effects of spending a year in space.

But after monitoring the differences between a pair of identical twins as one traveled to the International Space Station and the other stayed on Earth, researchers say there’s more work to be done to understand how long-term space travel can affect a person’s body.

A team of dozens of researchers released an article Thursday in the journal Science detailing the results of a study on Scott and Mark Kelly, twin brothers and astronauts. At age 50, Scott Kelly spent 340 days at the International Space Station, while Mark Kelly remained on...

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