The Black Knight satellite conspiracy theory claims that there is a spacecraft in near-polar orbit of the Earth that is of extraterrestrial origin, and that NASA is engaged in a cover-up regarding its existence and origin. This conspiracy theory combines several unrelated stories into one narrative.
A photo taken during the STS-88 mission claimed by some to show the Black Knight satellite is catalogued by NASA as a photo of space debris, and space journalist James Oberg considers it as probable debris of a thermal blanket confirmed as lost during the mission.
