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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.
The first one-year mission to the ISS will take place in 2015. One of the astronauts, Scott Kelly, has a twin, Mark, who will remain on Earth. The brothers have volunteered to be guinea pigs to look at effects on Scott Kelly's body in weightlessness in comparison to Mark Kelly's body on Earth.