When NASA astronaut Mark Vande Hei launched into space 11 months ago, he did not know how long he would be off the planet, let alone that he would be up there long enough to set any records.
But when the clock strikes 12:24 p.m. EDT (1624 GMT) today (March 15), Vande Hei will claim the title of the U.S. astronaut with the single longest spaceflight in history. At a mission elapsed time of 340 days, 8 hours and 42 minutes, Vande Hei will surpass the duration logged by NASA astronaut Scott Kelly on March 2, 2013.
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