Secret US Space Plane Can't Hide From Amateur Sleuths

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The U.S. military likes to be a little sneaky with its robotic space planes. Unlike typical spacecraft, these vehicles can shift their orbits, frustrating the global network of skywatchers who keep track of just about every man-made object rotating the planet.

But the sleuths have their tricks, too. They’ve tracked down the X-37B on its second secret mission. And the information the skywatchers are finding says quite a bit about the classified operations of this mysterious spacecraft.

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