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 Space Shuttle, landed at NASA’s Kennedy Space Center in Florida on October 27th after spending a total of 780 days, or more than two years, in space. That flight marked the X-37B’s longest mission yet in…