A UFO photobombed astronauts making repairs to the International Space (ISS) earlier this month - setting off a wild frenzy of speculation online.
The spooky incident happened on October 7, when Flight Engineers Reid Wiseman of Nasa and Alexander Gerst of the European Space Agency conducted a spacewalk outside the International Space Station to fix an electrical problem.
In video shot by Nasa and uploaded to YouTube last week, the UFO can be seen hovering just for a few seconds behind the astronauts, before the camera cuts to another angle.
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