If you don't believe that humans have contacted aliens, then new evidence has emerged that may change your mind.
A British man says he believes he has spotted a UFO rising above the Earth's surface during Nasa International Space Station's live feed. He claims that the object appeared as the stream from the ISS was inexplicably cut for several seconds.
John Craddick, a self-styled 'alien hunter', spends a lot of his time watching the live feed, and says he's 'never seen anything like it before'.
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Watch the shocking footage yourself here...
Credit: Nasa
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Mr Craddick, from Wolverhampton, told the Mirror: "I've been watching it [the live feed] for years but never seen any UFOs on it before.
"I was showing a friend how it worked at around 11.30pm when the feed cut out, and 35 seconds after it came back on, this object appeared.
"At first it was really small and then it grew bigger, lasting for about 25 seconds."
Mr Craddick is now convinced that it is proof of alien life because he says there is "nothing human that can fly that high."
This isn't the first time something mysterious has happened with the ISS feed. In July last year, conspiracy theorists raised the alarm after the ISS feed was cut when an object was spotted just above the Earth's atmosphere. The incident was reported by YouTuber Streetcap1 through a video.
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Other Alien Spottings
Credit: PA Images
Professor Stephen Hawking is a believer in the existence of extra-terrestrial life. He has previously said: "To my mathematical brain, the numbers alone make thinking about aliens perfectly rational. The real challenge is to work out what aliens might actually be like."
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And the number of extra-terrestrial sightings appears to be on the rise.
Footage uncovered on YouTube last month appeared to show a four-side structure in Antarctica reminiscent of the pyramids of Giza in Egypt.
Watch the video here...
Credit: YouTube / thirdphaseofmoon
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The construction of Egypt's Giza - built around 2500BC - has baffled experts for centuries. Slave labour has been offered as one explanation for the complex structure, but several theories have also suggested they could only have been built with the help of extra-terrestrial beings.
'Thirdphaseofmoon', the YouTuber posting the video online, has suggested that US Secretary of State John Kerry has landed in Antarctica in order to make contact with the aliens, although it remains unclear what evidence he is using to make that assertion.
Many scientists believe the freezing climate in Antarctica was much warmer in the past, which could suggest they were built millions of years ago when the climes there was more temperate. A 2011 study found tiny pollen fossils buried deep beneath the seafloor in the continent, suggesting the last remnants of vegetation in Antarctica vanished about 12 million years ago.
Dr Vanessa Bowman previously told the Daily Star: "Go back 100 million years ago and Antarctica was covered in lush rainforests, similar to those that exist in New Zealand today."
Another theory for the Antarctic pyramids is that it could be a natural phenomenon known as nunatak, when mountain peaks appear just above large glaciers.
However, if the structures do prove to be man or alien-made, it could change our understanding of history.