A video has been shared online analysing a photo from the Apollo 16 landing.
Commanding officer John Young can be seen in the image taken by Charles Duke Jr as he collects lunar samples.
But it’s what is going on in the back that has got people talking.
According to the footage an alien base can be observed, alongside a spaceship and extraterrestrial beings.
The clip was uploaded to YouTube channel UFOmania yesterday and has already racked up more than 13,500 hits.
And people were quick to speculate what the object really means for space history.
One comment read: “That’s because the US never went to the moon.”
And another added: “Most of the moon landing pictures were taken from Earth.”
Before a third claimed: “The moon landings were a hoax.”
An unnatural protrusion stands out on the surface
Apollo 16 was the tenth manned mission of the United States Apollo space program.
It was the fifth and penultimate to land on the Moon and the first to land in the lunar highlands.
It launched from the Kennedy Space Centre in Florida on April 16, 1972 and lasted 11 days.