There have been many people who claim to have witnessed both UFOs and aliens, however there is no proof available to the general public. If proof does indeed exist, it is held as confidential information by the government.
No. Cows exist only on Earth, not in space.
since we are not native to mars (many contradicting theories exist but we will ignore those for now) we will be aliens from space (earth) when we visit mars.
If space aliens do indeed exist, they exist for the same reasons we exist. Whatver those reasons may be.
In real life, no space aliens are known and proven to exist.
no people who think they see a UFO is a aircraft and aliens are fake well it all depends on what you believe. I myself think that the government hides things from us and a lot of things exist that we have no clue about. They may exist or not. Who knows? Not us.
Yes they actually existed... It does not only direct to aliens as "UFO's" or living from outside the Earth. Aliens can also be directed as those people who are deviating the norms; those who act differently from the society. They can be alienating themseoves from us.
The way the question was originally spelled, I can't tell if it was trying to ask if aliens really exist or asking where they are. Assuming that we mean "space aliens" here, the answers to both are the same: We don't know. There's no credible evidence that life exists anywhere but Earth (a couple of inbred mouth-breathers claiming to have been "probed" is not "credible evidence").
CRAZY people believe so but in reality... no aliens do not exist!
There's already an existing agreement between those two.
There is no evidence that Earth has been invaded by space aliens.
If you mean aliens from outer space, then probably, 'Yes", somewhere, but not here on Earth.
No. Aliens are people from another country who have retained their citizenship in the other country. Aliens as entities from outer space have not been shown to exist.