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 1998 NASA photo is believed by some to show the Black Knight satellite, but NASA has stated that this is likely space debris, specifically a thermal blanket lost during an EVA mission.
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The Daily Omnivore 