Black Knight Satellite (orbital object)

The Black Knight Satellite is an object of unknown origin thought to be in earth orbit, considered by some sources to be an alien satellite of some 13,000 years old.

It has been linked to early February 1960 newspaper reports of a dark satellite of then-unknown origin -- at the time, it was feared it was a Soviet spy satellite -- that was in a near polar orbit. The U.S. Air Force later identified it as "a space derelict, the remains of an Air Force Discoverer satellite that had gone astray"; decades later, the Discoverer program was itself revealed to be a front for the Corona program, an American spy satellite operated by the C.I.A. Directorate of Science & Technology and U.S.A.F.

Resources

 * http://skeptoid.com/episodes/4365
 * http://content.time.com/time/magazine/article/0,9171,894745-1,00.html