While constructing the international space station, astronauts capture a strange object on camera, which raises suspicions around the world.
But the observation of the unknown spacecraft by the ISS crew is not an isolated incident, several similar UFOs have been observed above Earth over the years.
Throughout the 1950's - 1960's mysterious satellite's showed up in an unfamiliar orbit around the Earth. One of the first reports of this kind of UFOs was reported by Major Donald E. Keyhoe in 1952. He claimed what he called 2 'Artificial Satellites' circling earth.
One of the most infamous 'artificial satellites" is the Black Knight which is according to conspiracy theories, an artificial satellite of extraterrestrial origin that has orbited Earth for approximately 13,000 years but is it of alien origin or is it just a piece of space debris or something that broke loose from the ISS or other spacecraft?
If it had been an isolated incident, the so-called Black Knight might have been a large piece of space debris, but over the years many more of these unknown objects, like the Black Knight, have been sighted above the Earth which can no longer be a coincidence.
Below are some of these unknown objects in space.
The next video from History goes deeper into the UFO phenomenon, 'The Black Knight'.