NASA astronaut -- and Commander of the International Space Station -- Scott Kelly on Friday broke the record for time in space -- for U.S. astronauts, at least; the overall longest flight of 437.7 days belongs to Valeri Polyakov, and the Washington Post points out that Russia’s Gennady Padalka has spent a total of 879 days aloft. Kelly brings a unique asset to the long-term study of health for spacefarers, because his twin brother Mark, here on Earth, serves as close to a perfect control subject as NASA could hope to have. Kelly is a prolific tweeter about the progress of his year-long mission aboard the ISS; on the occasion of beating the time-aloft record, his modest acknowledgement read only, "Records are meant to be broken. Look fwd to one of my colleagues surpassing my end 500+ days on our #JourneyToMars!"
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