NEW: We now have our first solid evidence of how the human body responds to long-term spaceflight. And it looks like good news for a trip to Mars. https://trib.al/kshHJTf
But the first study of a twin in space has also thrown up some mysteries. https://trib.al/kshHJTf
(1/2) We talked to that twin, @StationCDRKelly. Here's what he had to say:
“[Astronauts] have the choice of being a human research subject … You can choose or not choose to do or not to do the science. But so few people travel to space, and the idea is that we’re there for science. I think it’s kind of your obligation to sign up for all of this stuff.”
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