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The footage, showing a “UFO” spinning 180 degrees at speed, is the latest in a string of alleged sightings caught on NASA livestream cameras on the International Space Station (ISS).
Many of the earlier films have been dismissed by sceptics and hoax busters as anything from a reflection on the camera lens.
Other explanations included the moon in the background, space junk, meteors or even satellite being ejected by the ISS itself.
But committed UFO investigators, who are convinced aliens in space craft are investigating human presence on the ISS, claim this one cannot be talked down.
Scott C Waring posted the footage, recorded on January 5, on his website ufosightingsdaily.com.
In an accompanying blog, he said: “This amazing footage was shot from an astronaut’s GoPro while outside the space station this week.
“The GoPro was hooked up directly with the live Internet link for all to see.
“How do I know this is a UFO? Watch and see how this does a perfect 180 degree turn in the sharpest possible way that even an F16 could not match.
“It knew that it was coming too close and might come into view, so it did a quick U turn by doing an upside-down 180 degree turn and returned to where it came from.
“No meteor or lost tools could do a 180 degree turn and accelerate while doing it.
“Excellent evidence that the space station is not only being visited, but is under the 24/7 watchful eyes of aliens…as well as UFO researchers.”
But UFO hoax buster Scott Brando, who runs website ufoofinterest.org, tracked down the original footage and found it had been heavily zoomed in to make the object look bigger.
The original footage was actually filmed during a space walk by astronaut Terry Virts on February 25 2015.
Mr Brando concluded the object seen doing the flip was just an ice particle – something that has previously triggered claims of UFOs in NASA space footage.
He told Express.co.uk: “I found it is old footage from ISS Expedition 42.
“The video was taken by US astronaut Terry Virts during two spacewalks.
“It’s just a small piece of debris, a small ice particle that’s all.”