A disc shaped UFO interrupted a NASA live feed and zoomed past the ISS, conspiracy theorists claim.
In nail-biting footage brave astronauts move outside the craft, protected by nothing more than space suits, to film the daring spacewalk.
But around 14 seconds in, a white object zooms into view in the lower left side of the shot.
According to some keen-eyed viewers, the unidentified object actually slows down as if it is being controlled.
Describing the 2017 video, Anomalous Phenomena Researcher Bruce Fenton told Daily Star Online: “About 14 seconds in a ‘craft’ enters the scene from bottom left, it appears circular until it slows down and turn on one narrow side, we can then infer it is actually disk-shaped.
“Objects do not decelerate in space unless they are under some kind of control.
“Hard to tell the size but it seems far off in the distance so it is probably very large.”
Commenting on the video on Facebook, Kenneth Rolack asked: “Did they catch a UFO on camera what was that white ball?”
Ariez Tré said: “Twenty seconds in you see a small ball of light blazing towards earth.”
While some debate if the UFO is of alien origin or a “bubble”, Flat Earthers argue that the whole video is a fake.
April Rose Davison wrote: “Wow, fake curvature… the ‘station’ even curves with the fisheye lens.
“What was that thing that fell away at the beginning of the video, and what are those astronots [sic] even doing?
“Just messing around. Wake up! Use your eyes and your discernment.”
Alexander Zollinger added: “Such a bad fake, earth don’t spinn [sic] but changes always obviously because of many cuts in this short supposed live video.
“To [sic] much curvature, for that distance.”
This comes after an expert in military radar said UFOs may have always been around, but only recent “top secret” technology has uncovered them.
And a US Navy pilot said a “dark mass” emerged from the ocean and swallowed a missile.