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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.
Because the typical trip in space is some six months, the Kelly brothers will, in essence, be an experiment themselves, giving NASA a better understanding of how long stints in space affect astronauts â in preparation for an eventual human mission to Mars.