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At the end of this, Kelly will have a total of 522 days in space (adding on a day for accumlated hours spent), which will beat out Mike Fincke's total record of 382 days in space. Because he's been on a Hubble servicing mission, Kelly has also flown higher than a majority of astronauts since the Apollo era ended.
NASA is sending astronaut Scott Kelly to live on the International Space Station for a year. That's the longest any U.S. astronaut has spent in space and twice as long as crew members usually stay on the space station. A year is a long time to stay anyplace. But staying a year in space has some special challenges.