The Black Knight Satellite is the name given to an object captured on camera by NASA astronauts during a 1998 space shuttle mission. Conspiracy theorists claim the satellite is of extraterrestrial origin and possibly up to 13,000 years old and orbiting Earth in near-polar orbit.
The legend has been circulating since the sixties, and now some believe they have spotted it hovering over the Philippines.
A video from a resident in Santa Rosa, in the Philippine province of Laguna, shows what appears to be a black object floating through the sky.
Prominent alien enthusiast Scott C Waring unearthed the YouTube video and posted it to his blog UFO Sightings Daily.
In a blog post titled “Black Knight Satellite UFO Silently Moves Over Philippines”, Mr Waring claimed it is irrefutable proof extraterrestrials are watching Earth.
Mr Waring wrote: “This object seems to be drafting through the sky, however when I make a close up of it. I find it baffling.
“The object has an opening on its top. It has a brownish red tint and the open on its top has a few long spikes on it. The shape reminds me of one of the dark knight satellites
“This is 100 percent alien, no doubt about it.
“I have heard of the UFOs over the Philippines, but this is the clearest video I have ever seen from there.”
The Black Knight Satellite theory developed in 1963 when NASA astronaut Gordon Cooper was reported as saying he had seen the satellite while in space, but there was a media blackout upon his return and the US space agency allegedly put it down to cosmic hallucinations.
A decade later in 1973, Duncan Lunan, a researcher from Scotland, looked back at the Norwegian scientist data from 1928, before claiming the “messages” suggested the Black Knight was sent by aliens from Epsilon Boötis, as a welcome message to Earth 12,600 years ago.
In 1998, the first alleged photographs of the satellite emerged and were taken by astronauts on the space shuttle Endeavour, as it made its first flight to the ISS.
NASA however has looked to debunk the claims by saying the Black Knight Satellite was actually a thermal blanket accidentally dropped from a space shuttle.
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Former NASA engineer James Oberg said that most UFO sightings such as these are nothing more than “space dandruff” floating in front of cameras.
He said: “I’ve had enough experience with real spaceflight to realise that what’s being seen in many videos is nothing beyond the ‘norm’ from fully mundane phenomena occurring in unearthly settings.”
Mr Oberg argued the human brain is not wired to make sense of these tiny objects floating above Earth.