The United States Air Force's secretive X-37B space plane has been circling Earth for more than 10 months, and there's no telling when it might come down.
The X-37B looks a lot like NASA's now-retired space shuttle, only much smaller. The unmanned vehicle is about 29 feet long by 15 feet wide (8.8 by 4.5 meters), with a payload bay the size of a pickup truck bed. For comparison, two entire X-37Bs could fit inside the payload bay of a space shuttle.
Just what the X-37B does for so long while circling our planet remains a mystery, because the space plane's payloads and missions are classified.
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