Does our universe ever end? Is there like eventually a boundary/wall or something if we traveled as far possib
449942
As far as we know, the only "wall" is the event horizon of the observable universe, the events beyond it from our point of observation are too far away to have their light reach us given the age of the universe. This "wall" of observation is approximately spherical (mod the local curvature) and is continually expanding at the speed of light. Every observation point in the universe has its own event horizon/observable universe.\nOtherwise, there is no evidence to think that the universe is anything but infinite. Recent observations of the cosmic microwave background give us information that the cosmology of the universe is flat, ie. planar. This does not tell us whether the universe is compact or not. The only other types of cosmologies that agreed with Einstein's equations were spherical and hyperbolic.\nFor more information, see the source.
179128
Some scientists think you'll just wind up on the other side of the same universe. Especially if Universe is curved inwards or outwards. Like walking around a beach ball, you'll wind up where you started. Or if universe is"flat", you'll just wind up on the other side of the universe. Kind of like a video game screen, there is no such thing as the edge.\n\nAlso universe may be much bigger than 13.7 billion light years away. It may be so big that light from the "edge" will never reach us as universe is expanding and in fact accelerating. The edege of the universe may be expanding faster than the speed of light because of the accelerating expantion.I know you are thinking nothing can travel faster than speed of light, but exception to this rule may be that universal expantion can travel faster than speed of light. \n\nIt's weird, but that's what they say.
1049362
yes i do.  it begs the question...so where is the edge of the universe...and what does it look like?  is it moving further outward or just hanging out like a big wall?  very deep.
334137
the universe is finite yet has no boundaries. it may be something like the two dimensional surface of a sphere.  nothing inside or outside the sphere exists for the two dimensional surface.  nothing exists outside the universe in this model.
347537
I have given an answer to this elsewhere, but I will repeat it here.\n\nAssuming that by the question you ask, you are essentially asking what is beyond the edge of our Universe, the answer to which will change depending on whether we live in a flat, open or closed Universe.\n\nOne way to try to understand it is to throw away a dimension, and imagine being a 2 dimensional being living on a sheet of paper. Sort of like a cartoon that you drew. To them, the Universe they occupy consists of only the paper itself. There is only up/down, left/right, there is no in and out of the paper for them, it may exist for us observing them, but they can't see us, and they are not aware of this extra dimension. Living on this sheet of paper, whilst flat on the desk there is quite obviously an edge beyond which to them, is nothingness...... hmmmm\n\nOk, so now imagine that they aren't living on a flat piece of paper but on the surface of a sphere (say of a baloon for example). The inside and outside of the sphere is a dimension inaccessible to them. Therefore, there are now NO edges to their universe. If they travelled upwards from their position (NOT leaving the sphere), then they would eventually come back to where they started. If you then started to inflate the baloon, it would expand, but to the "cartoon" people, all they will experience is seeing their surroundings expand. To them, their universe is expanding into another dimension, that they cannot see, and that it inaccessible to them.\n\nThis in a way, but with one dimension less, could be what is happening to our Universe. There may be no physical edge that we can ever come across, but it could be expanding into another dimension. \n\n\nOn the other hand, if you are asking if the Universe will, one day, simply cease to exist .... then that is a completely different answer!!!!\n\nThe Universe is expanding - into what, could be another dimension - and the amount of matter in the Universe will determine whether or not this expansion will stop and reverse, or whether it will carry on for eternity!  As it happens there is evidence to suggest that the expansion of the Universe is actually accelerating, and so the end of the Universe will be a very dismal cold place.  There will be no stars left giving out light, the heat of the Universe will be stretched out over infinity!  It will be the death of the Universe.\n\nIf there was enough matter in the Universe then the gravitational pull of all the matter could force the Universe to start to collapse back in on itself. Eventually it would all come together in one place in what would be called "The Big Crunch" - and this would be the end of the Universe as we know it.
1009683
Hey I don't wonder about space rather its quite a bit interesting to wander in the space.....Its known journey began from Big Bang.....Our Universe is just 156 billion light years wide.....so keep wandering beforing it comes to an end.....
424938
The 3d space of the universe has been theorized as the 3 dimensional surface of a 4 dimensional sphere.  An analogy is our planet, where we live on the 2-dimensional surface of a 3-dimensional sphere.  When you travel on the surface of the earth, there is no border or edge to fall off or cross into another dimension.  In the same way, the 3-d space of the universe has no border or edge.  If you travel far enough in a "straight" line you will end up right where you started.\n\nThis means if the universe is expanding then there still is no receding border.
9649
It does not end and its growing, before you try tackling such a question, answer the micro-level questions of the same kind.  The universe encompasses all that exists, and by default then, it is largely unknown.  We don't know where the universe ends, and all evidence points to it being endless and growing, therefore we make a conclusion based on a portion of the information actually needed.
15497
Probably find a ship graveyard.\n\nNo...for real...I don't think it is possible to reach the edge of the universe.\n\nPrint this out, then if it happens, you can say, "I told you so."  :)
90873
Nope, not what my theory says. My theory is as follows:\n\n"...the Universe as many see it, is expanding. Anything expanding must have boundaries. THus, boundaries can be anything holding something, in the Universe, the boundary is space, which is matter. Thus, anything inside something (or something finite) must be rotating."\n\nThe Universe my friend is not infinite, but finite with endless boundaries. It's like a ballon. As you blow air in the ballon, it expands, but there is no boundaries (pretend there is no plastic boundarys). But there is boundaries, because as you blow in the ballon, it is also expanding the boundary, (the air on the outside). The outside air is the boundary.\n\nThe Universe is much mroe complicated, unfortuanetly, but still with the same concept. It is also expanding, and as it expands, it also pushs it's boundary outward (the space outside of it). Space is matter! ANd therefore, the space, or the matter, is the boundary.
265923
Yes. The universe is constantly expanding. It is possible we are all being sucked into a massive black hole, far far outside the reaches of our universe which would account for the the expansion of our universe. Additionally, the best competing theory for the start of the universe is the big bang , where everything expands out of one tiny point. It is reasonable to think that the universe could end in the opposite way - The Big Suck, where we get pulled into a massive black hole, just like the one you describe. So yes, I think it's very possible.
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.
215635
The thing is ... a parrallel universe may exist. We cannot prove it one way or another ......YET! :) How do we know that another universe and our universe and many other universes .... do not exist in a metaverse? And if so .... maybe something like distance etc. exists in that metaverse ... which imparts some of it's qualities to our own universe and indeed to any other universe within that metaverse. Hence ..... we may not even have a void outside our universe at all.
90394
The current theories have predicted how large spacetime is, and many Astrophysicists are now working on finding who is beyond our universe. \n\nSo no, space is not infinite in the sense that most people think of. Outside of our universe is still a mystery, but keep in mind that there is not three demensional space outside of our universe, and no time, either.
122538
Currently the universe is expanding. However, we are not sure yet whats going to happen in the future. This is because it is possible that the universe will constantly keep on expanding as it is right now. Or it is also possible that the gravitational pull of the universe will be so huge that it will collapse under its own gravity. Right now, we are almost at a point of intersection between these 2 cases and in a few thousand years we'll know exactly where this is going. Ofcourse, you and I wont be around to witness that, but astronomically its a small amount time.
1084780
Milliways?\n\nAnyhoo...\n\nExcuse the geek humor.  It depends on what you mean by the end of space.  If you mean the destruction of the universe, there's a lot of theories out there.  If you mean the physical edges of the universe, there is nothing, no vacuum.  The universe is all that exists, there is nothing outside it.  It's a difficult concept to visualize sometimes.\n\nSome end-of-the-universe theories include the big crunch where the outward movement of the universe reverses itself and returns to a common origin; the opposite of the big bang.  Opposite of the big crunch is the quiet freeze, where the universe keeps expanding, planets drift so far away from each other, entropy takes control, all energy is slowly expended and the universe drifts into a quiet soft end.  Those two theories depend on the cosmological constant.\n\nThere's also a theory where many of our cosmological constants which define the laws of physics and allow for the universe to exist could change and matter simply crumbles at its most basic level (even quarks, which are base atom components, would fall apart).  Another somewhat worrying theory is that physicist working in supercolliders could set off a quantum vacuum collapses, this off course assumes that the quantum vacuum is not at is lowest stable state which is unlikely.\n\nOne of my favorite theories is the result of M-theory, otherwise known as Brane theory.  Brane theory suggests that the laws our universe is governed by a "membrane" created from supersmall (Planck length, 10^-35 meters) one-dimensional strings.  It's easiest to think of the piano, music is created but is not tangible, it is created from vibration of strings.  The way this membrane is folded creates the laws and constants that govern our universe.  There could be, literally millions of membranes and millions of universes.  The theory goes onto suggest that our universe was created from the collision of two membranes; and so too could it end that way.\n\nThere's a lot of different theories, if you're interested in end-of-the-world/end-of-the-universe theories I'd recommend you visit Exit Mundi, linked below.
36543
As I understand it, the universe is in fact finite.  However, it's expansion is continuous and progresses at such a rate that we can not, with current technology, move beyond to see the end.