Buzz Aldrin twin astronauts ABC This Week

March 21, 2015 1:53 PM

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The Kelly brothers describe their preparations for a space study starting next week that will contrast Scott's body from a year-long mission aboard the International Space Station with retired astronaut Mark's body on Earth. "Studies will compare data from the genetically identical Kelly brothers to identify any subtle changes caused by spaceflight," NASA says.

Bolden and former astronaut Buzz Aldrin explain why the study could bolster a manned mission to Mars.

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