YouTube UFO hunter Streetcap1 posted NASA Apollo 16 images in a video on his channel.
NASA images of the Moon, Mars, other planets, as well as footage taken by the International Space Station, was scoured in an extensive search for evidence of alien life.
The expert said in the video: “I have been browsing a lot of photographs tonight and I discovered this on a moon photograph
“It is on the edge of the photograph, that is as close in as I can get.
“It appears on quite a few photos, not all of them. It is some sort of structure and it is just sitting orbiting the Moon.
“You can see its structure when I get a close up of it. To me it looks like some sort of structure.”
Viewers have suggested it could be the mysterious Black Knight satellite, also known as the “Dark Knight”.
After watching, Traci Hill posted on YouTube: “Looks kind of like the Dark Knight.”
Valle Janes later added: “Someone commented it looks like the Black Knight… I agree.”
Others were less convinced, offering up alternative explanations.
One poster with the user name Coil Smoke said: “Could be high terrain like mountain peaks still getting sunlight.”
Jack Gordon added: “Photographic artefact more likely than alien ship.”
The 1998 Nasa image (left) and an earlier alleged Black Knight snap over the Moon in July 2015.
The Black Knight Satellite is the name that has been given to an object captured on camera by NASA astronauts during a 1998 space shuttle mission.
There are alien conspiracy theorists who claim the satellite is of extraterrestrial origin, possibly up to 13,000 years old orbiting Earth in near-polar orbit.
The myth developed in 1963 when NASA astronaut Gordon Cooper was reported as saying he had seen the Black Knight 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.
It has been reported that a decade later in 1973, a researcher from Scotland, Duncan Lunan, looked back at the Norwegian scientists’ 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.
A close up of the ‘UFO’ taken from the YouTube video.
Someone commented it looks like the Black Knight… I agree.
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.
However, many sceptics claim the legend was retrospectively created after the 1998 images emerged, with the preceding odd events weaved into the story to make it more convincing.
Sceptics also say the existence of the Black Knight satellite has been debunked many times, and the NASA images show, as the space agency said at the time, a thermal blanket accidentally dropped from a space shuttle.
In 2015, YouTube debunker NUA, laid the mystery to rest.
In a video called “Black Knight Satellite UFO Documentary – Truth Exposed 2015 – (Debunked)” – he claims to conclusively prove the ‘Black Knight’, as photographed in 1998 NASA images, was nothing more than the dropped thermal blanket.
The blanket was lost by the crew of the Endeavour space shuttle as they worked on the developing the International Space Station (ISS).
In his video, NUA compared NASA video of the Endeavour mission which shows a thermal blanket on the ISS.
The same blanket is then seen being dropped by the crew as it tumbles away into space.
He highlights the blanket as being exactly the same shape as the ‘Black Knight’ in the 1998 pictures seized on by conspiracists and explain the object only appeared to change shape because it was turning as it fell away.