Mysterious footage said to depict three UFOs racing by Planet Earth is causing an out-of-this-world discussion on YouTube, as some people think it's proof-positive of alien life.

The 4-minute long video titled "UFO Mysteries: UFOs, Angels Or Biological Creatures Seen Leaving The Earth?" was uploaded a week ago and has more than 214,000 views.

The video, reportedly shot from the International Space Station, shows three unidentified flying objects shooting upward out of Earth's atmosphere.

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Just when the lights appear to blast off the planet, the video feed is cut by NASA, with a message subsequently displayed on screen stating: "Please stand by. The High Definition Earth Viewing experiment is either switching cameras, or we are experiencing a s temporary loss of signal with the International Space Station."

Close to 200 people have commented on what they think the video is actually showing, including the usual, classic responses such as swamp gas or a weather balloon.

Commenter Michael Clottey is among the viewers saying it's proof of alien life.

"BINGO! Caught them red-handed leaving Earth's orbit," he wrote. "That's the kind of proof that is needed. Excellent footage, absolutely Fantastic. One for the books. Let the debunkers try and say it's space trash. I don't think there is anything they can say about this footage apart from just saying it is fake and just CGI [computer-generated images] hahaha. Wow amazing stuff. This must go viral."

Kyle Quinn noted: "I just adore how they cut the feed off, they make it so obvious they know what's going on too."

Joe Berry, however, was far more skeptical, saying: "Wow objects coming from our OWN planet, must be extraterrestrial."

Other comments include:

"Seen one of these above my house in the sky. At first it appeared as a yellow orb and solid, moving slowly. But when it took off looking through binoculars it had the exact same flutter effect and did not look as a solid anymore."

"Canadian geese caught in an unfortunate updraft. You hear about their frozen bodies falling to Earth about three days later."

"NASA, Never A Straight Answer!"

NASA has not provided any explanation for the curious lights.

Britain's Sunday Express noted, "Of course, its possible the YouTube video has been doctored, or the unexplained objects are simply a trick of the light."

The paper says, "Critics claim the alleged UFO sightings on the live feed are simply down to NASA's poor camera and this latest sighting is likely to be a distorted view of the moon."

The International Business Times reports, "This is not the first time conspiracy theorists claim NASA has inadvertently captured extraterrestrial activity. Earlier in January this year, UFO hunter Toby Lundh spotted what he claimed was an UFO just outside the space station as he was monitoring the live feed on his laptop.

"Lundh added that there are 'always some UFOs showing up' and 'NASA always cuts the feed when a UFO gets close to the station.'"