Are there extraterrestrial life forms on other planets in this universe?
356008
At the present time, we just don't know.  If you saw pictures of aliens, what you saw were fake.  Nobody on earth has yet to produce a verifiable image, photographic, electronic or hand-drawn, of a living creature that originated elsewhere in the universe than from our home planet.  Nobody.\n\nAlso, at the present time, we suspect that there is no other planet in any nearby solar system that's host to a sentient race of beings like us.  That does not mean that some form of what we call "life" is impossible, but just think: out of the billions of living critters that now inhabit, or did in the past, our home planet, only one of those life forms evolved to the point where it (us) can even begin to think about such questions.  That by itself will tell ya we're sorta unique! ;-)\n\nIt sure would be interesting, wouldn't it?  But imagine if you will what it might be like if those alien creatures we fantasize about were an advanced race of carnivores that look upon us as another breed of cattle, fit only for eating!  Yow!  Or, how about if they were friendly, warm and fuzzy folks who just love to make nice with us - but they carry an infectious disease that there's no cure for.  Oh boy.  Or maybe, like Darth Vader, they just consider us a nusiance worthy of one blast from a super-mega cannon that blows Earth into dust?  Whoa!  Hey dude: you SURE you wanna meet aliens?  \n\nAll this is just idle speculation.  The hard fact is, even if there were creatures just like us somewhere in the universe, we are not gonna know about it, because the distances between them and us are just too great to permit interstellar travel, the hazards of such a trip are insurmountable, and no means of communication can travel fast enough for us to hear from them and be able to answer back.  Kind of a bummer, isn't it?
25028
I am almost 100% certain that life DOES exist on other planets, and may be in completely unfathomable ways, that we could not begin tio understand.\n\nIt us very interesting that the prospects of life having once existed on Mars are become more likely, due to the significant discovery that water once was in abundance there.\n\nThe trouble with finding life in other solar systems is that the distances are just too great. Even radio waves take 4 years to reach the nearest star from the Sun, then you need 4 years for the reply. The majority of stars are MILLIONS of light years away. so EVEN if there are a Billion planets with intelligent life there is no way of being in contact.\n\nBUT I do hope I will find out that DEFINITE life has been proved to exist before I die.\n\nI find this a fascinating subject.
381174
I'm not after the points as much as I'm want to give my views on the matter.\nAliens... I believe there must be life somewhere in the Universe other than Earth, given that it is so big. However I don't believe for a moment we are going to have visitors from other planets. The green men thing is all bullsh*t to me. If there is some other form of life somewhere in the Universe (very far, I expect), I expect it must be microbiotic or something of that sort. And I don't believe the "end of the world" will come from the space either, that's plain stupidity. \nThere you go.\n\nET phone home!
348137
if theres not i would be extreme surprised.  the universe is so huge that it would be ridiculos to assume or think there isnt.  even though we have only explored probably less then 1% of the universe we have still found planets that we think would be able to suport human life (remember not all life would have to be carbon based like us either) so even if there isnt a planet that we could live on some other type of creature might think its paradise.  the answer to your question is yes there is most likely life other then ours out there somewhere. although it would depend on what you mean by "life" if you mean intelligent life i still think yes there probably is although they have found fossils of bacteria on mars so technically that means there was at one point there was life in our solar system other then earth.
439827
duh! there are.....it wud be ridiculousif there werent.the universe is abt 4 to 5 billion years in size.how can there be no other life in other galaxies or planetary systems
327734
I don't know about experiments and alien visits. But I know that I'd like to think that there is more out there some where. I don't even know if there is a chance that other intelegent life exists for not but I can't help but think that other planets in the universe have to be suitable for some form of life and continue to sustain something. We may never find it or know about it, especailly in this life time but there has to be more than just Earth.
282593
I do believe it. For one, the universe is absolutely massive and there are billions upon billions of solar systems that we have not discovered. Are we so conceited to believe that WE are the only intelligent species in a universe where there are billions of planets? The probabilities are extremely high that there are a number of other intelligent species. We just haven't found a means to detect them or communicate with them yet.
184609
I do think there is a very good chance, statistically, that life exists on other planets. As I stated in a question very similar to this one, comets contain organic-like compounds that could be the building blocks for life, and such comets travel among two or maybe even more stars in a galaxy (interstellar comets).\n\nAs for watching us from above; the only things watching us from above are birds, flying insects, stuff in trees if you happen to be under a tree, people in skyscrapers if you are below a skyscraper, people in aeroplanes, satellites with Earth-directed sensors, etc.\n\nDeities, aliens and Jesus (which all may be one and the same) are probably not watching us from above or at all because they probably don't exist and if they do they probably have not discovered us yet because most complex forms of life on Earth are young relative to cosmic distances (which are measured in time). But it's as false for me to say "I know for a fact that aliens aren't watching us" as it is for anyone else to say "I know for a fact that aliens are watching us".
748593
There is no evidence that alien species from other worlds or other galaxies have ever visited Earth. The examples given have all been debunked by numerous scientists. We'd like to believe there is life out there, but we haven't heard from anyone yet. Because the distances are vast -- measured in hundreds of thousands of light years -- it is more likely that we would have radio or television transmission, which travels at the speed of light, than a visit in person. Maybe they're listening to our TV broadcasts and don't think we're intelligent enough to contact.
18963
This is a little hard to answer.\n\nFirst, we haven't found any.  So there's no positive evidence, so it's hard to be really sure. \n\nBut on the other hand, there are billions and billions of planets like ours, and it would be really weird if ours was the only one to have life on it.\n\nSo most astronomers think there's probably life out there somewhere.  I hope we find it.
362430
I think we would be very naive to believe we are the only life form in the universe.As vast and diverse as it is,I believe there has to be a reason for the formation of these planets to sustain life.That said,who knows when the life was present on these planets?And who knows what life forms are out there as we speak?Perhaps Mars and Pluto had life trillions of years ago but there are no remnants now for us to find.It's a fascinating topic.If you think about the possibilities,it's incredible.
1014608
Probably,\n\nI don't know if they are walking talking aliens, but I wouldn't be surprised to find out there are other forms of life that didn't start in our solar system.\n\nAfter all, there are billions and billions of solar systems. Are we so self-absorbed /self-involved that we think this could only happen to us.
47051
not in our solar system. \nBut you also have to remember that even if there is life on other planets, we are assuming that they are as advance as we are or more. Could it be that maybe they are in a pre-industrial era and have no means of space exploration?
1049105
Proof, so far there is none, however if you take into account that there are trillions of galaxies each with trillions of stars all of which may potentially have planets, then you have to consider that there is a good chance that there is at least one other planet out there with the potential for life.
333414
Definitely. What are the odds that, among all the gazillions of planets and stars and galaxies, not ONE other life-form has developed? Hell, I don't even care if we can find sentiency, if there's just LIFE somewhere I'll be happy.
1177396
I think aliens exist, but I don't think they live among us. Think of Earth and all of the cosmic and environmental factors that are required to sustain and promote life.  I think it would be unusual for similar conditions to exist in other galaxies that will produce intelligent beings that look exactly like humans.
381971
I doubt that Earth is the only planet in the whole Universe that can sustain life.  There will probably be some other planets out there somewhere with some sort of life on it.  Whether it's intelligent life or not is another question!\n\nThere may very well have been life on Mars, or on other planets in our solar system at one point,  but we have yet to find it, or any evidence.