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Scott Kelly in space

Published 9:06 PM ET, Sat October 17, 2015
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As of Friday, October 16, 2015, astronaut Scott Kelly has spent more time in outer space than any other American. NASA
Kelly is currently more than halfway through a nearly year-long mission aboard the International Space Station. NASA
On the day he broke the record for most days spent in outer space by an American, Scott Kelly tweeted this photo and the caption: "Woke up to the #Himalayas outside our window this morning. #GoodMorning and #HappyFriday! #YearInSpace" Scott Kelly/NASA
Kelly is scheduled to come down to Earth on March 3, according to NASA, after spending 522 days in space. On September 17, 2015, he snapped a photo during an early morning flyover of the United States. NASA
Kelly began his year-in-space mission on March 27. He launched from Kazakhstan aboard a Russian Soyuz rocket along with two cosmonauts. Bill Ingalls/NASA
The mission is a chance for scientists to study how the human body responds to long-duration space flights, NASA says. Scott Kelly/NASA
Kelly is joined on the one-year mission by Russian cosmonaut Mikhail Kornienko. NASA