Does anyone know what exists outside this Universe?
480353
You have never been.........Mannnnnn it's a huge party.... Didn't you get the invite?\n\nNAHHH....really no one knows cause we cannot see that far and no one will in any of our life times.  So we can only speculate and have fun :)))
1036977
hows does knowing where the universe come from help you at all? the whole question is unrelevant... its exists, thats all you need to know... the probably with humanity is that we are so focused on where we came from, not where we're going...
1102284
Great philosophical question.  I believe there are other living things somewhere in space.  Even if you believe we are a random happening, there are so many millions of planets out there that there would have to be a second occurrence like what happened to us.  And if there is a god, then I am sure other civilizations were created as well.  So either way, there is a good chance there are other life's somewhere in space.
1137921
If there was just nothing, we would never know what could happen because we wouldnt exist.\nI believe there is more out there in the universe than what we know of.\nWether we discover these things or not is hard to ever say.
1007231
Current information is insufficient to give a correct answer. Once we explore more of the universe, maybe we could have a logical answer.\nst
1107409
I do not believe you could ever find the 'end' through the knowledge we have today.  This would require us to exceed the speed of light, obtain infinite energy, warp space as a blackhole does, etc.  I do believe there are infinite universes.  Our universe exists as a 'point in infinitely dimensional space.  \n\nOur universe was created from the chaos of the lawlessness of nothingness, we could have been 10 billion times larger in mass or the size or total mass of an atom.  We may be able to difine how much mass the universe has, but possibly never the size.\n\nIt would be like defining the size of a dimensionless point.
48409
There is certainly no evidence for that, just some very speculative ideas.\n\nEverything that we see - planets, stars, galaxies, cats, frogs - is part of this universe. That is pretty much by definition. Basically anything that we can ever observe is in this universe.\n\nThe speculation about other universes arises from a couple of scientific theories. One is from thinking about what came "before" the Big Bang. (I put "before" in quotes, since the Big Bang was the origin of both space and time for our universe, so it isn't clear at all that anything like our concept of "before" even applies.)\n\nWith these ideas one imagines some sort of meta-universe, from which lots of smaller univerese pop up and form. Some of these form and decay quickly, in microseconds. Others form and become big but nothing happens in them, no stars just some hydrogen floating around. In the lucky ones, such as ours, the universe pops into something large with all the right parameters for stars, planets, capybaras and Lindsay Lohan.\n\nThe second approach comes from an interpretation of Quantum Mechanics which, frankly, few physicists believe. It is not a crank theory though. This is the "many-worlds" interpretation. Basically it says that on the quantum level when ever there is a choice between a particle doing A or doing B the universe actually splits. In one universe choice A exists, in the other choice B. It is easy to see that this would lead to gazillions and gazillions of "parallel universes," some of which are very close to ours but with slight differences. Say, identical except Lindsay Lohan is Emperor of Earth.\n\nThere is no experimental evidence for either the pre-big band meta-universe idea, or for parallel universes from the many-worlds interpretation of QM. (Personally I think the many-worlds interpretation is just wrong, while the meta-universe idea sounds good.) So it's all speculation.
1054859
if ur asking if we, as humans, can be sure the no one else exists on the other planets? then no..no one can be so sure, but the facts gathered about the other planets, such as chemicals in the air, etc... can tell something about the planets..
427364
there hasn't been any found yet.... but... the possibility of life on other planets is very  high....  :)
73345
The last response made a good point.  Science only seeks to answer certain questions.  What exists "outside" the universe? What existed before the Big Bang?  These are questions that scientists currently are not seeking.  That question is left up to the philosophers for now.  \n\nThe questions really point to a better understand of the universe and whether that question is important, relevant or even consistent with our present knowledge of the universe.  \n\nAstronomers and physicists find the surface of an expanding balloon a good analogy for the nature of our universe.  The surface, just surface mind you, of that balloon has no center or edge to it.  Just like how we understand the universe.  The surface material of the balloon would be what we call space-time.  \n\nWhat is outside the surface of the balloon?  Well there is no balloon material outside so it is not space as we know it but one perspective says it is a future balloon surface.  Just like inside the balloon was once a past balloon surface.  \n\nThe universe could have a similar analogy.
693179
according to string-theory other universes do exist in what is called a "landscape of probabilities", but the probability of one being parallel as in just like ours, is extremely low.\n\nand 60 words are way too few to explain that, so try to be realistic next-time.
205075
I doubt that there is life there or elsewhere in the universe. Yes there is ice in outer space and probably on portions of planets which means there probably was water out there at one time. However there are too many variables missing for there to be life as we know it. Believing that there are physical life forms other than as we have here on Earth is just speculation. The more space is explored, the more we know that Earth is uniquely made. If you get a chance see the dvd, "The Privileged Planet".
947592
i believe they exist, only because I believe that the universe doesn't end meaning that mathematically on some other planet, it maybe one out of the speed of light, but it is possible beacuse theere are millions apon billions of other galaxcies all with many other planets and chances of producing life\n\nhowever with that being said the closest galaxies have aready been examined and concluded impossible to produce life as the planets of the other systems are way too harsh to support life, let alone intellegent life, not too mention those galaxies are light years away, so any one who beleives in alein encounters are bogies.
765259
No, there is almost certainly life within the Universe besides Earth, and there is certainly life within the Milky way besides earth.
765945
They do not exist in the universe.\nMaybe in our minds . . .
1113632
What is beyond the borders of the universe?\nIs it truly possible for the universe to go on forever? If there is an end, what’s on the other side?\n \nBefore we can address these questions, we must first define universe.  The word universe denotes all space and everything (matter, energy) contained within it.  The prefix uni means one.  The root verse means word, turn, or whole.  Thus our universe has traditionally been thought to be the one whole of all substance or matter.  Questions regarding our universe persist today.  Does it have a beginning and end, or does it go on forever and ever?  Is it linear or curved?  If it has limits of length or curvature, then what lies beyond the Universe?  If something lies beyond the Universe, then can’t we accurately call that the Universe?\n\nSome lay people and some scientists conceive of the universe as infinite space.  Others define the universe as finite, or limited (perhaps curved), space.  Still others incorporate the elements of matter and/or energy into their definition of the universe, as opposed to the space beyond matter and energy.\n\nGiven these concepts of our universe, some scientists conclude that the “totality of space could be infinite. Shrink an infinite space by an arbitrary amount, and it is still infinite. (Scientific American March 2005).”  \n\nAs to the notion that we live in an ever expanding universe, moving away from every other universe on the fabric of space-time, some scientists are careful to point out that “Andromeda, our nearest large galactic neighbor, is actually moving toward us, not away. Such exceptions arise because Hubble's law describes only the average behavior of galaxies (Scientific American March 2005).”\n\nIn accordance with your supposition that our universe is in another universe, “it has been hypothesized by some scientists that the universe may be part of a system of many other universes, known as the multiverse (http://en.wikipedia.org/wiki/Universe).” Modern astrophysicists talk about multiple "pocket" universes that branch off from one another.  Stephen Hawking points out that parallel pocket universes can have no effect on a real observer inside a single pocket, so, according to Hawking, they are theoretical baggage that should be eliminated from cosmology, the study of the origins of the universe.\n\nSome string theories define the universe as a three-dimensional space in an invisible space having more dimensions. This is, in essence, a universe within a universe.  Our zone, a “braneworld” could periodically bounce into another parallel braneworld.  This may create what would appear as a Big Bang from one perspective or a Big Bounce of alternating expanding and contracting universe from another perspective.  Such a cataclysmic event is thought to occur 300 billion years from now, resulting in the rearranging and creation of a new universe.\n\nBeyond the borders of the universe, there are other universes moving through a multiverse.  While scientists do not commonly believe that our universe goes on for an unlimited distance, despite its present expansion, they allow for the possibility that the multiverse may go on forever.  If there is an end to our universe, what’s on the other side is called the multiverse.  If there is an end to the multiverse, another term may need to be coined to describe what lay people commonly refer to as infinite space.\n\nSteve\n:-D
1057879
I think you have it backwards.  The macrocosm reflects (to a degree), the microcosm.\n\nAt present, no-one knows if there are other universes.  My suspicion (not belief, just suspicion) is that everything that is possible is in some sense actual.  My other suspicion is that nothing is actual at all, so there is nothing to prevent the existence of everything.  Yes, that's a contradiction, but we're allowed to contemplate them once we step outside the bounds of what is knowable.