Source: Ifl Science
The X-37B space plane has spent 500 days orbiting the Earth on its fourth mission – and we still don’t have a clue what it’s doing up there.
The vehicle is an experimental and secretive project by the US Air Force. It’s fourth mission, referred to as OTV-4, was launched on May 20, 2015 from Cape Canaveral in Florida.
Its secrecy has led to both speculation and paranoid pondering.
Some have suggested secret surveillance. Theories range from spying on China’s space station, other satellites, or even back home on Earth, namely around the Middle East. Other more outlandish ideas suggest it could be a “space bomber” or a weapon to aggressively destroy rival satellites. Live Science has a nice round-up of these “imaginative” theories.