The 2nd X-37B which had been in orbit for the last 15 months returned to Earth yesterday.
Quote:
The official duration for OTV-2 was 468 days, 13 hours and 2 minutes on a voyage that circled the globe more than 7,000 times. The single-mission numbers surpassed the flight time amassed and orbits accumulated by any of the individual space shuttles in their reusable lives. Discovery had the fleet-leading credentials at 365 days and 5,800 orbits on 39 trips to space.
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Impressive.
http://www.spaceflightnow.com/atlas/...ing/index.html
Can't wait for one that can do a 5 year mission.