Life outside of earth?
961833
Life? Sure. Given the speed at which bacterial life formed on earth after it had cooled down enough, it seems that life itself is relatively easy to get going and so would be common in the universe.\n\nOn the other hand, even on earth, it took a long time for life to become multi-cellular. Out of about 3.8 billion years that life has been around, it was one-celled for about 3.1 billion years. This suggests that multi-cellular organisms are fairly hard to get going and so are relatively rare.\n\nAs for other *intelligent* life, I think it is rather uncommon. First, is the issue of how long a species lasts once it gets to radio technology (say). Given our own experience, it may be as little as a few hundred to a thousand years. If that is the case, the probabilities of time overlap with other intelligent life becomes fairly small considering the overall age of the universe and speed of the processes in it.\n\nOne basic fact that we have to come to grips with is that other life is not *obviously* seen around us. Given likely expansion rates and rates of technological developement, we would probably become obvious before too much longer (a few thousand years): we would send self-replicating probes into the universe, or do LARGE scale projects (solar system size). Since we don't see this in the universe at large, technologies reaching that level are almost certainly rare. I would be very surprised if there is currently another species with our level of technology or higher in our galaxy.\n\nHowever, the universe is a BIG place. There are a hundred billion galaxies in the observable universe, each with an average of a hundred billion stars. Even if we only look at spiral galaxies (ellipticals have the wrong composition for our form of life, at least), there are enough of them to almost assure at least one highly advanced technology somewhere. However, the distances involved are such that we may never be able to detect them, especially if we die off in a few thousand years).
602526
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.
68201
hmmm........... its not on earth!
912860
I highly doubt that there is intelligent life in our solar system there might be organisms on other planets like Mars. But there IS life some where out there. The Earth is infinately small compared to the the universe because the universe is forever expanding. There is no telling how many trillions and trillions of planets have intelligent life roaming around wondering if there is life on other planets just like we are.
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.
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!
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
553451
Life exists almost everywhere on earth, and it has many forms.  Some of which are almost impossible to detect and it's debated whether they're actually "life" (like virii).\n\nIf it could be proven either way, I would bet my worldly posessions and my right arm that there is some sort of life beyond Earth.  They might not be carbon-based or water-based, but I am certain that there are objects out there that consume things, grow, reproduce, and possibly defend themselves or even have rational consciousness.\n\nAs for some alien being looking just like a human and living among us, that's a different story.  I can't see two independent strains of life coming out so similar, especially considering the variety right here on our little planet.  Either we'd all be from alien roots, or the "aliens" would have originated from earthly roots.
312310
Is there such a thing as close by planets?\nWith all that we see in the night sky, not just stars but galaxies as well, what are the chances that we are alone in the universe?\nThere has to be intelligent life out there. We are all just too far from reach of each other. And most likely, other intelligence would be like us and send probes. Living beings could not survive the long travel, space probes could.
669093
you mean extra-terrestrial?
673531
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.
1184402
Yes, we will discover other planets that also sustain life, and we will do so within our lifetime.  I do not mean that we will physically go to these planets but we will discover this by placing much more powerful telescopes in orbit around Earth.  There is a definite signature that we will be looking for and that will be the presence of Oxygen in another planet's atmosphere.  If a planet does not have any oxygen in its atmosphere then it would not be able to support life.  There was a time billions of years ago on Earth when there was no oxygen in the atmosphere and at that time there was no life on Earth.  We may not discover other intelligent life on other planet's during our lifetime but i am sure that we will discover other planets that are supporting at least plant life if not primordial single cell life as well.
605896
"Are there any other life forms on other planets?"\nProbably, we just have to find them (or they have to find us).\n\n"Is it possible that when we expire we will be born on a other planet?"\nThat is a theology question, not a science one.
385152
Statistically it is pretty much a cert that there is life elsewhere in the universe notwithstanding the calculations are based on huge assumptions.\n\nThe issue is more one of distance ... bit philisophical but if life exists elsewhere but we are unable to perceive it, does it exist?
306692
of course. As long there is a living thing outside space, they r aliens. The possibility is low but the no. of planet is almost infinity so the possibility increases.
341926
There are theoretically countless planets, because there are countless stars, and a countless number of those will have a planet the same distance as ours. So there has to be countless other life forms out there.. the problem is, is that space is so bloody huge that the distance and time it takes to get anywhere far outways the task of actually doing it ( for other advanced lifeforms ).. And the chances that anything would choose to come our way is pretty bloody remote. But don't let religions lead you into believing we are the only lifeforms, that would be naive
807557
It's hardly surprising that we can see no sign of life out there.  Views of Earth taken from unmanned explorer craft like Voyager taken from within our own solar system show no signs of life either. If you can't see elephants, whales or even forests from only a few million miles away then looking at hazy dots that are planets thousands of light years away expecting to see obvious signs of life is a bit optimistic.\n\nIn addition, given the size of the Universe we can hardly claim to have looked everywhere whilst at the same time it seems inconceivable that some form of life has not evolved somewhere else.\n\nSpectroscopic analysis of stellar nebulae and other "gas clouds" in deep space has revealed the existence of basic organic compounds such as amino acids which are regarded as fundamental building blocks of all living things here on Earth. So if life itself hasn't been located elsewhere, some of the prerequisite precursors certainly have.\n\nThere are also several "fossils" found on meteorites believed to have come from Mars which may or may not prove to be the remains of living things which originated on Mars.