There are two separate questions here:
1. Is there life on other planets?
We haven't found any yet, but most scientists suspect there is. There are good reasons to suspect that there may be life on Europa, which is not a planet but a moon of Jupiter. It's recently been discovered that the way Titan flexes as it orbits Saturn indicates that it may have a huge underground ocean, and if so there could be life there also.
2. Are aliens real?
Not to put too fine a point on it, but no. We're almost certainly it as far as intelligent life in this solar system goes; the possible life on Europa and Titan are most likely on the level of bacteria or at most tube worms.
There could be intelligent life on planets orbiting other suns, but every alien you've ever heard of is entirely made up and not based on anything real. The evidence is pretty strong that if there is intelligent life elsewhere, it's either not very close or not as advanced as we are technologically... broadcasts from within a couple of dozen parsecs of us would be pretty obvious.
Yes, there are Aliens living on another planet because even we couldn't make a model of the universe in our Earth because the universe is way too big, but since it's so big it would be likely to think there's life out there, it's hard to believe that we are the only planet out of loads, with life.
So far there has been no evidence of alien life on any of the other planets, although many people speculate there could be or could have been in the past.
Yes. On other planets, we're the aliens, and we're real (unless you're into solipsism, in which case it's just youthat's real).On this planet, though... most scientists suspect there must be life somewhere other than Earth, but we haven't found any real evidence of it yet.
No. Also, if there is any life on any of the planets, it would not be alien; it would be native.
We are not aware of any "space aliens". In an galaxy of 400 billion stars, the odds are, I think that at least SOME other planets have something that we would recognize as "life", but there's no evidence either way.
'Aliens' are real. In any given country, a foreigner may be described as an Alien.
Aliens, in any colour, have never been observed by any credible witness.
It isn't completely clear what you mean with "interstellar aliens": aliens on planets surrounding other stars, or aliens capable of interstellar travel? In any case, it is currently unknown whether ANY life exists in other places of the Universe; whether it is aliens capable of interstellar travel, or even just bacteria on other planets. It seems likely, given the huge amount of planets in the Universe, that there is life somewhere else than Earth - but this hasn't been confirmed yet.
The presence of real extraterrestrial life has, as of yet, not been identified in our universe with exact measures. Therefore, it is currently impossible for humans to tell whether aliens need water, like humans do, to survive. However, there are many speculations on the biological structure of aliens. Some of these guesses are shaped like humanoids, others not. Obviously, though, we can't identify any as being wrong or right just yet (although some ideas are just crazy). We have also been successful in finding planets that are capable of sustaining not just any life, but HUMAN life other than our own. These planets are far away, however, and the immense distance of space keeps us from determining whether there are really humans, or any life, on these planets. If there are, however, they could be classified as "aliens" to us, and they would most likely need water like we do. Who knows?
In my opinion, i think aliens are never real. Well, some people believe in these stuff ,but if you take my opinion, i would say that aliens don't exist. And not in this liftime and not on any planet............
Yes because i have been abducted by one
in all my recherche i am positive that aliens are real there are Egypt drawlings saying that there are aliens and they say that they have met the aliens and have made Peace with them and if you do not believe me then go to any alien web sites and they will show you and tell you the same thing i am telling you now
It seems likely that there do exist aliens on other planets, however, we haven't found any in our own solar system, and other solar systems are too far away for us to get there with current technology, so we really don't know. UFO cultists would disagree, of course, but there is no convincing evidence that the planet Earth has been visited by aliens from other planets.
No one has any pictures of aliens because they are not real