Does the universe ever end? If so where?
830256
The universe is still expanding and speeding up, faster and faster.  The outskirts of the universe can boggle the mind.  It has been thought that the mass of the universe would eventually stop the outward push and eventually draw it back to implode in on itself, then repeat.  Like a thirty billion year old flower.  Now it is believed that the universe will die a cold death with the universe continually speeding off in all directions.  Maybe we will run into another universe that is moving towards our own.  And no we will not fall off a cliff, the universe is expanding at a uniform rate in ALL directions.  There will be no drop-offs...
1055543
when the world comes to an end?
5808
Nobody really knows for sure.\n\nThere's a theory that the universe is expanding in a spherical shape and will continue to expand until it reaches maximum entropy. At that point all of the energy and matter in the universe will be equally distributed and the universe will no longer be able to support life.\n\nThere's another theory that the universe will expand (again, roughly in the shape of a sphere) until all of the galaxies exhaust their kinetic energy. At that point the universe will begin contracting. When the contracting is complete a singularity containing all of the mass in the universe will form and explode in a big bang.\n\nIf you think about it, if the latter theory is true then it's possible that the universe has expanded and collapsed an infinite number of times in the past!
686202
Universe theories talk about a finite and unlimited Universe. The Universe is unlimited because it has no boundaries. There is no edge, no end where a spaceship would have to stop. See it as a tiny bug walking on the surface of a big balloon. The ballon has a finite dimension, but the bug will never find the end, so it is unlimited from the bug's point of view.\nSo, the Universe can be expanding or contracting or staying the same size. This is a very important question to answer in modern astronomy. Latest studies say that it is expanding, but it has not been totally proved.\nAnd where it is expanding? The Universe is creating more space and time where there is nothing.
214423
The universe has no end, just as the surface of a sphere has no end. In terms of the surface you can't describe its end, only in terms of a higher dimensional geometry. In that sense, "beyond" is meaningless since it is a term to relate to the same dimension as the universe. It's like "beyond the end of the world" for the surface of Earth -  there is no end, and at some time you might return to where you started from.
178670
If the universe is infinite, it doesn't mean that everywhere is the center, it means that it has no center. Or, if you mean relative to the existing matter...well, that isn't infinite, and has a defined center.
460814
Outer space must go out forever, else there would be an end to it.  If there were an end to it, what would be on the other side of the end?\n\nI can live forever, and I'm not interested in the "outer limits."  Plenty of interesting things all around.
1101320
What if we could bump into the end of the universe, what would be on the other side of that wall?  An infinite wall?
514889
Outer space extends to the end of the universe. Further, the universe is constantly expanding. No-one knows if anything is beyond the end of the universe.
65663
No.\nThe Universe is a physical object.  It has a definite size and shape.  The Universe is so big that we do not know its limits.  Our ability to comprehend is not the problem, our technology is.  If we had the right equipment, we could see to the end of the Universe and mesure its size and shape.
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
313515
The universe and space aren't the same thing. The universe was CREATED in space. Before the creation of the universe, it was just space. The universe now occupies space, and yes the universe is not infinite and according to scientists, the Big Crunch theory is the end of the our universe. However, space will still exist because the universe and space aren't the same thing.
52550
I believe the universe is a 'closed' shape, meaning that there is no 'edge', however it does have a finite size.  But just to entertain your question, if we one day did reach the End of the Universe we literally would be unable to describe anything on the otherside.  Everything we know about physics, space time, the fundamental forces, the universal constants and so on only exist in this universe.  Anything 'outside' of the universe could potentially then have different laws of physics and thus would be completely beyond our comprehension.  Words would literally fail.  For more fun reading, checkout the link in the sources.
193032
The above answers are interesting but, modern physicists speak extensively about 'multiverses'.  So, does one universe end at the edge of another? or, do they 'co-exist' in space and time? OR??????
592261
No one knows if there is an end of the universe. Remember the "Big Bang Theory" is, of course, just a theory. However, I think the universe may be growing into something, just like diffusion. The universe is growing into a space that no human mind is or will be able to comprehend until we create technology great enough to get out of our galaxy, out of our universe, and into something more. Something so far, far away that we most likely will not have enough technology to get to in our lifetimes or in many generations to come. It will probably take hundreds of years for humans to travel to another galaxy and back safely, but probably thousand to millions of years, if the human race still exists, for us to get farther - into something more, the land beyond.
1130955
The universe will end when the sun and all the stars collapse and engulf everything killing everything and sucking it all into a dot. We will all be dead, so it doesn't matter what happens after that. Of course, we still have a few billion years before that happens, so I wouldn't worry about it. Besides, I believe the Lord will return before then, but the universe will not end at that time, only change.
313044
When studying Astrophysics in Year 12, we learned that the Universe was created from pure energy and that it would probably end as a load of energy. So that made me think that maybe there have been other universes before that imploded as the 'end of the world' which then in turn created new universes. So it's possible that at the 'end' of this world, a new world will be created in its place, as the energy that will result has to go somewhere! (energy is neither created nor destroyed, it is merely converted).\nOf course we'll probably never know for sure....! ;-)