twins study

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NASA “Twins Study” May Help Scientists Send Astronauts to Mars

Summary: Astronaut Scott Kelly returned to Earth on March 1 after 340 days in space, the longest American mission. Scientists hope to discover how extended space travel affects the human body using Scott and his twin brother Mark as research subjects.

[DIGEST: ABC, Popular Science, NASA]

American astronaut Scott Kelly made a triumphant return to Earth on March 1 after spending 340 consecutive days in orbit. Not only is the length of time spent on the International Space Station remarkable—it’s the longest of any American astronaut—Kelly’s journey is also valuable to researchers because of the person he left behind on Earth: his twin brother.

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