Since the time I discovered that I can already think on my own, yes it is not just recently ;-), there is a lot of curiosity about ourselves as human living alone in the universe… We called the other species not from our planet as “Aliens”, well, there were documented events proving that indeed there were other lifeforms besides us!!!
According to Wiki, by definition, Alien or Extraterrestrial life is life that does not originate from Earth. It is also called alien life, or, if it is a sentient and/or relatively complex individual, an "extraterrestrial" or "alien" (or, to avoid confusion with the legal sense of "alien", a "space alien"). These as yet hypothetical forms of life range from simple bacteria-like organisms to beings far more complex than humans. The possibility that viruses might exist extraterrestrially has also been proposed.
On 13 February 2015, scientists (including Geoffrey Marcy, Seth Shostak, Frank Drake and David Brin) at a convention of the American Association for the Advancement of Science, discussed Active SETI and whether transmitting a message to possible intelligent extraterrestrials in the Cosmos was a good idea; one result was a statement, signed by many, that a "worldwide scientific, political and humanitarian discussion must occur before any message is sent".
Now, where are we? Ah, Aliens are among us…
Evolutionary biologist Simon Conway Morris says it is surprising we have not already discovered extra-terrestrials that look like us - given the growing number of Earth-like planets now discovered by astronomers.
He based his claim on evidence that different species will independently develop similar features which means that life similar to that on Earth would also develop on equivalent planets.
Convergence, is a theory, says evolution is a predictable process which follows a rigid set of rules.
"I would argue that in any habitable zone that doesn't boil or freeze, intelligent life is going to emerge, because intelligence is convergent," he said.
"One can say with reasonable confidence that the likelihood of something analogous to a human evolving is really pretty high.”
He has launched a new book The Runes Of Evolution, where he put forward all his arguments about the subject.
He has previously claimed that aliens would resemble earthlings with limbs, heads, and bodies.
And he goes further in the new book, claiming any Earth-like planet should also evolve predators like sharks as well as mangroves, and mushrooms, among many other things.
Well, personally, I think there is a quite amount of possibility in this… Let’s research more shall we???