Sceptics have long claimed NASA faked the missions, with some claiming they “admitted the 1969 mission was not possible”.
Other wild theories surfaced that Russia beat the US to the moon, after a baffling video emerged.
Now, another clip has gone viral after apparently showing an astronaut not wearing a space suit on the lunar surface.
UFO hunter Streetcap1 posted the snap of one of the astronauts involved in the 1972 Apollo 17 landing.
As it zooms in on his visor, a figure seems to appear in the reflection – without wearing a spacesuit.
“It is from a Moon photograph,” the YouTube user said. “It is a reflection from one of the astronaut’s face visor, so I thought it looked a bit strange.
“I took a picture of it using my software.
“What we appear to have here is a figure of a human not wearing a space suit, circa early 70s, it is an Apollo 17 photograph.
“He is wearing some sort of, I don’t know, waistcoat type thing… one leg there, with one shoe, another leg and a shadow of that figure presumably.”
More than 40,000 Americans have taken out insurance against being abducted by aliens.
The alien enthusiast admitted he had believed in the moon landing before he came across the pictures.
But viewers had mixed reactions after watching the footage.
“If not an astronaut then another being in a spacesuit,” one user commented.
Another disagreed, writing: “Just looks like another astronaut.”