Astronaut Twins Begin Unprecedented One-Year NASA Study

NASA is about to take yet another bold step toward sending humans to Mars.

At 3:42pm Eastern time tomorrow afternoon, NASA astronaut Scott Kelly will strap into a Russian rocket and kiss Earth goodbye for an entire year to live on the International Space Station. Meanwhile, his identical twin Mark, a retired NASA astronaut himself, will stay here on Earth. Both men, though serving on vastly different fronts, are the guinea pigs in a big-time NASA study that will examine the physical and p

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