Despite mankind travelling into space on countless occasions and expanding our knowledge of the universe, we're still no closer to solving life's greatest mystery; do aliens exist?
Well, I say that, but one man claims to have actually come face to face with a being from another world.
Ben Walgate runs the YouTube channel 401 Files. Obsessed with UFOs, he regularly posts about possible sightings and strange encounters that have been recorded across the globe.
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And the 35-year-old has now opened up about his own experience of meeting a strange, 'green' life form when he was just a boy.
Ben says he had been away on a camping trip as a Cub Scout at Snowball Plantation near York when the coach stopped to let the lads off to have a short walk and a break.
Speaking to the Mirror, he recalled getting split up from the rest of the crowd and spotting a figure in the distance.
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Looking back, Ben said he saw a 6ft 'green creature' about 25 yards away from where he was standing.
He said it either 'walked with a stoop' or was trying not to be seen.
One thing is for certain, though, it was 'definitely not of this Earth', he says.
"The wooded area wasn’t that dense, so I got a good look at this thing. It might have only been a few seconds, but we made eye contact, it had black eyes," said Ben.
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"It was such a weird vibe. Its head in proportion to its body was tiny.
"It’s not like the stereotypical alien with the grey skin and the big black eyes. This thing was more lizard.
"I’m not saying it had scales, it wasn’t snake-like.
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"It was olive green from head to toe, a very sleek, slender-looking thing, dark black eyes, little tiny head, long over-proportional sized arms that came past the knees.
"It was just other-worldly, it shouldn’t have been walking on two feet. This thing was walking right through the woods."
If you're sat there thinking that this sounds a bit of a stretch, Ben is adamant he is telling the truth, and is certain of what he saw that day.
He added: "I won’t just jump to anything and say it’s an alien. I'm getting out there and investigating some of these areas and following up on some of the stories that people have shared.
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"If there are intelligent beings out there, and I’m not saying there are, but it’s highly likely there are, if they were coming here for some reconnaissance or research, it wouldn’t be difficult in a place like the North Yorkshire Moors to stay hidden."
Dominic Smithers