In 2015, a clone will spend a year on the International Space Station while his doppelganger remains on Earth. Mark and Scott Kelly, the only identical twins who are also astronauts, have volunteered themselves for study, creating a unique opportunity to disentangle the health effects of space from those of genetics. Last year, Scott kelly was chosen to take part in the first one-year mission aboard the ISS, double the usual stay, along with Russian cosmonaut Mikhail Kornienko. Then last week NASA announced a twist: his brother Mark will be monitored on Earth throughout.
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