NASA allegedly cut the live feed coming from the High Definition Earth Viewing (HDEV) cameras mounted on the International Space Station (ISS) when a mysterious UFO appeared to hover over the Earth.

A message appeared saying the cameras being used in the HDEV project were having technical issues, but alien-enthusiasts said it was a cover-up.

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The YouTube video taken from NASA's live feed last week shows what Ufologists claim is a UFO rising from beyond the Earth's horizon. It shows a gray, misty object that emerges from beyond the Earth's horizon as seen from the ISS.

The mysterious object rises in the direction of the space station as if it were going to rendezvous with it.

UFO watcher Toby Lundh was watching the feed recently when he noticed the foreign object on his screen, appearing to be off in the distance but getting closer. Seconds later, the feed was terminated.

Lundh believes NASA intentionally interrupted the feed to cover up evidence of alien life and added that the agency has been doing for years.

"NASA always cuts the feed when a UFO gets close to the station," Lundh told Disclose.tv.

Recently, Lundh also accused NASA of removing archived recordings from its database that reveal communication between astronauts and aliens. The most recent "sighting" comes after a grey object was seen in space and then disappeared just before NASA switched cameras.

Imperial College Physics professor Andrew Balogh said there are simple explanations for mysterious things popping up in NASA's live feeds.

"Generally speaking UFO sightings are either explained by some artefact effect -- even some space junk -- or left unexplained as there is not enough evidence. It's difficult to judge from the video in this instance, because of its poor quality. If NASA has access to high quality images, they may investigate further," Balogh said.

TagsNASA, UFO sightings, UFO, aliens, space exploration, ISS