The Air Forces mysterious X-37B spaceplane is launching to space again this weekend

Update May 16th, 8:31AM ET: Bad weather forced ULA to push back the launch to its second 10-minute launch window, which begins at 10:13AM ET. Live coverage will resume at 10:03AM ET.

Original Story: The Air Force’s mysterious spy spaceplane, dubbed the X-37B, is headed back to space on Saturday morning for its sixth mission in Earth orbit. As usual with this spacecraft, its exact purpose is a secret, though the Air Force says the vehicle will be carrying a number of experiments on this trip and testing out new systems in space before returning them to Earth.

This launch comes a little more than six months after the X-37B returned home from its record-breaking fifth mission to orbit. The spaceplane, which looks a bit like a miniature...

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