They are often depicted as either little green men, bug-eyed creatures or terrifying monsters intent on wiping out all life on Earth. But if aliens do exist, what might they actually look like?

Hideously bloated slug-like aliens could be coming to "wipe out" humans in a "Star Wars" invasion, an Oxford University biologist has warned. If the universe is teeming with life as he expects, these ...

What do you think aliens look like? Well, an artist’s impression shows what most Brits imagine – and they have two heads, gills and the ability to change colour. Researchers asked 2,000 people to ...

This artist's impression shows what Brits reckon an alien would look like – with two heads, gills, and the ability to change colour. Researchers asked 2,000 people to describe what they think an ET ...

Scientists have long been trying to figure out whether there is life outside of Earth. Now, according to new research, we might not be alone in the universe. Scientists have revealed a new model which ...

If aliens do exist, one of the chief concerns is that they could be far more advanced than us — and a lot less friendly. Scientists have tended to pour cold water on this suggestion because they say ...

16:59, Wed, Nov 1, 2017 Updated: 17:06, Wed, Nov 1, 2017 Rather than being other-worldly, extraterrestrial beings may be indistinguishable from human beings scientists have claimed. According to new ...