Take a good look at the photograph above. NASA captured this image of a mysterious black object orbiting the Earth in 1998, during the first Space Shuttle mission to the International Space Station (ISS).

The space agency refers to the strange entity as item STS088-724-66 in its catalogue of space junk floating in low-Earth orbit (within 1,200 miles). Jerry Ross, an astronaut who took part in that mission, says that the object is a wayward thermal blanket that broke loose while his team tried to attach an American module to a Russian module on the ISS. But for a small, devoted following, it’s a 13,000-year-old, artificially made satellite known as the Black Knight satellite. So, could this peculiar object really have come from ancient aliens? Or is it just an innocuous piece of space debris?

nikola tesla in his laboratory