Nobody can say that space is endless without a doubt until we know that for sure. People say that it is very unlikely for any living thing to be out there, but the way Earth formed could have just easily been done somewhere else, so why can't there be life out there, I'm not talking about just aliens, but what about anything "Super Natural"?
133290
spacetime is finite and boundaryless.  if you wish to you may think of it as the 2d surface of a sphere, but remember, nothing inside or outside the sphere exists for the 2d surface.  in this model, nothing exists, not even space or time.
431970
The concept of "beyond space" is flawed; space-time has no beyond for there to be anything in at all. Our limited perception of the stuff around us in three dimensions leads us to imagine the universe or even all of space as some giant sphere or disc of matter floating in space, but really, space and time being the same thing mean that our universe and all within it is everything we can perceive, full stop. Ergo, there is no inside to be outside of. \n\neither that or its turtles all the way down :-)
286848
No body know for certain. However, the universe is so vast, with so many celestial bodies that it seems rather improbable if the only place in the whole mutiverse that harbors life is planet Earth.
176661
Been watching one of those Startreck movies again, eh? I do believe if God did make life outside the Earth, he would have mentioned it in the Bible. Say, Gen. 1:18 "Then God created the Aliens without likeness of man, and placed them in other planets where darkness was. He breathed life to it, making it alive." v19 "He did not want Adam & Eve to know so he kept it a secret to thousand of thousands of generations."
326974
No one has yet shown that there is any life beyond that on Earth. \n\nAs far as life in general is concerned I am reasonably sure that there is life on other worlds and there are currently a couple of space missions in development that may find earth-like planets and even find signs of life on those planets in the next few decades.\n\nWhether there is intelligent life out there is more debatable.\n\nConsider that in 4.5 Billion years the Earth has only produced one technological intelligent species. This species has only really been able to consider possibly contacting or being contacted by intelligent beings from another world for the past 50 years. In that time we have just about managed to avoid nuclear annihilation, so far, and are currently well on the way to destroying the Earths eco-system.\n\nIf intelligent life is anything like Homo Sapiens then it will probably not last more than a few hundred years at a level where it is technically able to contact others.\n\nGiven that, it is extremely unlikely that two intelligent species will evolve close enough together to contact each other in the short time frame that they are able to do so.\n\nSo while there may be intelligent life elsewher in the universe I doubt we will ever find it.
56002
The only planet we know of that has life is earth. Based on that very limited knowledge we can only estimate that earthlike life forms would have had great difficulty evolving in the worlds, in and out of the solarsystem, that we know of today (new planets are discovered almost daily). It is probably possible for terrestrial organisms to survive and maybe even prosper if introduced to some shielded and protected water rich enironments on the other worlds described above but there is a great difference between merely surviving and evolving. Life requires very special environments and conditions for a very long period of time, hundreds of millions of years, to evolve. We cant say for sure that those conditions were ever present on any world other than earth. But once life is born on a world it is extremely hard to extinguish completely as it would constantly evolve to adapt to changing environments. Life has nearly ended on earth many times as environments changed but has always bounced back. So if there was life on any other world in our solarsystem it would be so plentiful by now that we would have found traces of it in their atmospheres or in their soils. But we havent.
277764
No I believe there is other life out there somewhere. The universe is huge so how could we be the only planet to have life?
92641
But how do we know that life doesn't exist under the surface of all these moons and planets around us, as a majority of them we have never even been on top of the surface. I think it is quite egotistical of us humans to make an assumption like this when we haven't fully figured out what life is about on our own planet. Not only could their be life on other planets, but maybe we just can't process that kind of information into our brains yet, because aren't we using such a small percentage of our brains?
141742
This is interesting question. My opinion is: why not!! Maybe some forms of life that we don't know. There is some life forms even 11 km under the sea, under extremely high pressure. Some kinds of bacteria live without air too. Fish don't use the same air like us, but they are alive. There is so many different forms of life even on planet Earth, so why not on other planets? After all, if we did not see something, don't mean this don't exist!
56623
I think so!\nIf life exists on the top of the large mountain where there is only snow and no oxygen in the air, then life should exist on other planets!\n\nDo you know that, life exists in deep sea where there is no sunlight! If life sunlight to live, how do you explain?\n\nLife also exist in caves very down in earth where no light is present. They are bacteria! They absorbe heat from boiling water, thats how they obtain their energy!\n\nThat may be quite enough to explain how life may exist in extreme conditions and thus beyond planet earth
606375
Absolutely not and I think it would be incredibly arrogant of us to think we are the only life in the entire universe, considering how many billions of planets, if not galaxies, there are.  There are more that can sustain life.
378166
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.
478800
I wouldnt say there isnt any life outsdide our solar system. there can be a very high possibility that there is inteligent life out there.
153856
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?
566938
There are _trillions_ of stars in the Universe.  Our galaxy, the Milky Way, is composed of 300 - 400 billion stars.  There are _billions_ of galaxies in the Universe, many dwarfing the size of ours.\n\nThe chance of other life _not_ being out there is so close to zero that it can't even be calculated.  There are infinite possibilities in this Universe, and we haven't begun to study more than a tiny bit of them.\n\nTo anybody that has the audacity to say "no" there isn't, then get an ego check.  We aren't the only intelligent life in a Universe of infinite possibilities.
353190
Well, that's very interesting cuz if u think about it, if it's NOT alive but creates life (plants) than how could something dead create life???  How long could earth possibly live/survive without that glorious light?  Is the earth alive? Hmmmmmmmmmmm\n\nVery thought provoking, I'll have to put this question on my watch list!  It is an eternal source of power tho (like God).  So my answer must be yes than:o]
5090
The problem with your question is that assumes that there are only to possibilities; we're alone, or there are little green men walking around.  \n\nChances are that there is some form of life other than ours in the universe, but it more than likely will be much more different than just having different skin and being a different size.  Think about how weird all the animals at the bottom of the ocean.  Then think about how similar their need for water, oxygen, food, how similar their DNA is to ours.\n\nNow try to imagine life evolving on world rich in totally different elements, exposed to total different frequencies and concentrations of energy.  The thing about life on other planets isn't really whether or not it's out there, but whether or not we'd even be able to recognize it when we see it.  \n\nThat and the fact that it takes years just to move from one solar system to the next.  Just getting to another planet capable of supporting life would more than likely take decades, even centuries with any conceivable technology(though an alien lifespan could make that less significant).  Any alien capable of travelling that distance, whether by nature or technology, would once again likely be so different from us that we would never recognize one another as living beings.  So there you go, little green men, probably not, alone in the universe, who can say.