Aliens do exist and they look like humans, according to a biologist.
Extra-terrestrials have likely developed in human-like form on other planets that will also have plant life and oceans.
Evolutionary biologist Simon Conway Morris makes the claims in his new book 'The Runes of Evolution', in which he argues intelligence and evolution is not random but relies on a strict set of biological laws.
He writes: "I would argue that in any habitable zone that doesn't boil or freeze, intelligent life is going to emerge, because intelligence is convergent.
"One can say with reasonable confidence that the likelihood of something analogous to a human evolving is really pretty high."