Is the Black Knight Satellite ancient alien tech or mere space debris?
The Black Knight Satellite is a mysterious object in Earth's orbit.
Some claim it's an alien artifact, dating back 13,000 years.
Its origin was speculated after signals were detected in the 1950s.
Nikola Tesla reportedly received signals linked to it in 1899.
Photographed by NASA during the 1998 STS-88 mission.
Conspiracy theorists say it monitors humanity.
Scientists dismiss it as space debris or misinterpreted signals.