When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. That enigmatic U.S. military X-37B robotic space drone has now chalked up more than 500 days ...

The Air Force s X-37B Orbital Test Vehicle Mission 5 successfully landed at NASA s Kennedy Space Center Shuttle Landing Facility Oct. 27, 2019. The X-37B OTV is an experimental test program to ...

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On April 22, 2010, the U.S. Air Force launched the super-secret X-37B space plane on its first spaceflight. [‘On This Day in Space’ Video Series on Space.com] This space plane is also known as the ...