A video shot on the International Space Station has been claimed as evidence that UFOs have visited Earth.
The clip shows what looks like large, white objects moving with unfeasible speed above the planet.
Posted two weeks ago, it has gained more than 400,000 views. It's not clear when the footage itself was filmed - some appears to be older than two weeks - but many of the commenters appear convinced.
Others have suggested it's space debris or meteorites streaking across the atmosphere.
Rather fewer have pointed out the irony that the ISS itself - our awesome, actually-real space station - doesn't appear to count as a space ship in the eyes of the conspiracy theorists...
Take a look - what do you think? Real or fake?
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