Black Knight satellite conspiracy theory

The Black Knight satellite conspiracy theory claims that a spacecraft of extraterrestrial origin is in near-polar orbit of the Earth, and that NASA is covering up 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.
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