U.S. DOD
Space.com: X-37B Military Space Plane's Latest Mystery Mission Hits 700 Days
The longest X-37B mission to date is 718 days.
The U.S. Air Force's X-37B military space plane has now been circling Earth for 700 days, just a few weeks shy of the vehicle's spaceflight-duration record.
The robotic X-37B launched on its fifth and latest mission, known as Orbital Test Vehicle 5 (OTV-5), on Sept. 7, 2017. And the reusable spacecraft, which looks like a miniature version of NASA's space shuttle, has been zipping around our planet ever since.
Exactly what the X-37B is doing up there remains a topic of much speculation; the solar-powered spacecraft's missions, and most of its payloads, remain classified. The Air Force tends to talk about the X-37B program in general terms, stressing that the space plane tests technologies for future reusable spacecraft and takes experiments up to space and back.
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Update: Everything We Know About the Air Force's Secret X-37B Spaceplane (Popular Mechanics)
WNU Editor: We still do not know what it is doing up there.
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