Nasa has denied cutting the live feed to the International Space Station as a strange unidentified object flew through the shot.
UFO hunters spotted the flying object in video footage beamed back from the space station on July 9 before it abruptly cut out.
The incident led to renewed conspiracy theories that the US space agency was trying to cover up the existence of aliens.
Nasa has been repeatedly accused of cutting video feeds to the ISS when strange objects have floated into view.
But it has now insisted there is a mundane explanation for why the feed was interrupted.
A Nasa spokesman told CNET that the video feed comes from its High Definition Earth Viewing experiment on board the ISS.
This experiment has four high definition cameras mounted on the exterior of the space station that provide different angles of the Earth.
According to Nasa, the experiment is programmed to automatically cycle between the different cameras
Pointed at the Earth, the experiment is programmed to automatically cycles through different cameras.
The spokesman told CNET: ‘The station regularly passes out of range of the Tracking and Data Relay Satellites (TDRS) used to send and receive video, voice and telemetry from the station.
‘For video, whenever we lose signal (video comes down on our higher bandwidth, called KU) the cameras will show a blue screen (indicating no signal) or a preset video slate.’
The footage was captured from the live feed and p;osted on YouTube by user StreetCap1, who described it as a UFO entering Earth’s atmosphere.
On the video, he said: ‘Remember a UFO is an unidentified flying object.
‘This could well be a meteor or the like.’
However, he then goes on to say that the move is strange.
‘What made it interesting was the camera cut off when the ufo seemed to stop.’
The post caused many alien hunters to accuse Nasa of trying to cover up the arrival of aliens.
Others have offered other explanations for the object seen moving in the footage.
Some have said it could be a low orbit satellite that appears to be descending towards the Earth’s horizon as the space station moves away from it.
Others have suggested it could be the Chinese Space Station Tiangong-1.
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