A video posted on YouTube claims to show a UFO filmed above Earth from the International Space Station.
The clip posted by Daniel of Doriaa shows a white object moving at unfeasible speed above the planet.
It has gained more than 400,000 views in just a few days, as UFO fans flocked to give their opinion on whether or not it's real.
It's not clear what the object might be - other than a super-imposed image, space debris or meteorites But many of its viewers are convinced.
The video was posted recently, but it is also not clear whether the footage is old or new.
So what do you think? Real or fake?