The mystery of the 'Black Knight' : An alien ship orbiting the Earth?

The Black Knight satellite legend has circulated for decades. It involves stories of strange radio signals picked up by Nikola Tesla. Later, claims arose about the US Air Force detecting satellites before Sputnik. A 1998 photo taken during the STS-88 mission fueled the myth. However, this object was identified as a thermal blanket lost during a spacewalk.

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