In January, 1989, the Russian Phobos II, an unmanned satellite destined for Mars was allegedly knocked out by an unidentified elliptical object measuring 20 kilometers long.

{video source: giorgiogil}

Former astronaut Buzz Aldrin spoke about the future of space exploration and said the public would be interested in a monolith on Phobos, one of the two small moons that revolve around Mars. {source: CSPAN}