Space.com: Air Force's Mysterious X-37B Space Plane Breaks Orbital Record
The ongoing mission of the U.S. Air Force's robotic X-37B space plane is now the longest in the clandestine program's history.
As of today (March 25), the X-37B has spent 675 days on its latest Earth-circling mission, which is known as Orbital Test Vehicle-4 (OTV-4). The previous record was 674 days, set during OTV-3, which lasted from December 2012 to October 2014.
It's unclear what the new duration record will end up being; most X-37B activities and payloads are classified, and the Air Force has historically been tight-lipped about landing plans.
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Update #1: Secretive Air Force X-37B mini-shuttle breaks orbital record (Florida Today)
Update #2: Happy Wanderer? Mysterious X-37B Space Plane Breaks Its Own Orbital Record (Sputnik)
WNU Editor: Truly impressive.