FoxNews notes that star gazers have been tracking the orbit of the US Air Force’s X-37B (previously noted), and, for the second time, have lost track of it.  Apparently the first disappearance was caused by a change in orbital inclination, which may reveal some of the vehicle’s capabilities.

The most recent disappearance is fueling hypotheses the spacecraft has returned to earth.  If so, it would be inside the 9 months originally speculated for its duration.