Why does the universe have no end?
594695
The universe cannot have an end, it has to be infinite and completely symetrical. This leads to three possible scenarios for its shape a saddle shape, a spheroid, and a flat plane. Different experiments have led scientists to believe that space is an infintie flat plane. The main reason why we know that if there were edges to space then we would have to me moving towards some objects and away from others. This is not the case as all observed entities are moving away from us. This leads to the assumption of a infinite expanding universe. \n\nAs far as our perception is concerned we are not inside of anything since the universe occupies all of the space that we can observe so the universe is everything. But if somehow you could step out of our universe into a higher dimension you dont know what you would see. There are some theorists who believe our universe is one of many universe. But since there is no way to see out of the universe we may never be able to answer this question. I agree that if you start thinking in this manner it can get quite perplexing\n\nTo the person who said space must have an edge to expand think of a baloon. If we go down a dimension imagine that our galaxy is a penny glued on the surface of a baloon. To us the baloon has no edges at all since we cannot see out into the third dimension, yet the baloon is expanding. So from our vantage point we live on an infinite surface that is expanding and causing nearby pennies to all travel away from us.
10099
Just supose that the universe end in some point, that has a boundary. What would be outside? Nothing? And... what is between Mars and the Earth? Also nothing. The universe is... "the nothing", and never ends. Anyway, and suposing that you forget the relativity theory and you want to know where is the star/planet/thing that is farest from the "centre", you can say that the radius of the universe is less or equal to the speed of light times the age of the univers.
626622
The universe is an indefinite entity.It is bounded by 'nothing' even in the strict sense of modern physics.
1098923
There is an end to this universe.  But, it is constantly expanding and contracting.  Empty space is what lies outside of it.  The universe is encroaching into empty space.
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.
33684
The Universe is boundless, yet finite.  So you could never exit the Universe.
1023621
Yep, that is one of those questions man has asked for a long time.  As others have said, are minds cannot comprehend it.  It is difficult and impossible for us to imagine something with no end and no beginning.  All of our existence have both in it.  I always ask myself, what is on the other side of the end of space?  yep, we can't understand that either.  Perhaps, because we measure time and God does not, the concept of always existing has a meaning to him far beyond what we are capable of perceiving.  I am sure there is an answer.  But if we say that He was created by someone or something, then the next question is,. OK, who created it or that?? and so and so and so.  How about just ask if the Americans won a world cup match and then we can all understand that because it has closure.  If you get the answer, tell us please
397592
The universe has no discernible edge, but neither is it infinitely large.\n\nThis is because the universe has non-euclidian geometry.\nEssentially this means that parallel lines will meet at infinity. Crazy huh?\nIf you keep going in a straight line long enough you will eventually come back to your starting point.\nThink of it as if the universe is a balloon. If you walk in a straight line along the balloon's surface, you will travel all the way around the balloon and come back to your starting point. Then just imagine that the balloon is expanding.\nThe balloon (our universe) gets bigger. But with the universe, it is not expanding INTO anything.\n\nAre you an advanced physics student?\nIf so, read about Einstein's Theory of General Relativity (With loads of lovely maths :) ) to gain more insight.
897624
The universe is driven by entropy. Its energy on the whole stays the same, but that energy started off in a small number of very hot things and over time is being redistributed to a much larger number of cooler things. \n\nOne possible fate of the universe is that this will continue indefinitely until every particle in the universe has about the same energy. Nothing else would then ever happen in the universe. The temperature of such a universe would be everywhere very, very cold (below 4K).
126793
Nobody can know because the universe is never ending.  Because God put them there to look pretty :D
210647
What lies beyond the edge of the universe is matter that is receding at a speed greater than that of light relative to us. Check out the Begy atomic model, It proposes that the big bang has no beggining and no end and is an ongoing process. Belief in God is possible, comprehension of God is not.
154209
It doesn't end.  It goes on. If you took a line and ran it in any direction off the planet's surface it would just keep going into infinity,  if you could freeze time and walk on that screen,  you would never get to the end.  There is no end.
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.
1083084
The Universe cannot be infinite, because it is expanding, which points to its origin where everything began at the same point, namely the singularity of the Big Bang. Therefore, if it is expanding, it is bounded.\n\nHowever, it is thought that it probably doesn't have an edge, much like the Earth doesn't have an edge. If you started in a spaceship and went in a straight line, you would eventually end up where you started, much like if you started at the North Pole and went in a straight line, you would end up back the North Pole.\n\nThe reason: although you would be going in a straight line on the 2-D surface of the Earth, that line is curved in the 3rd dimension. So, if spacetime is curved in the 4th dimension, you could be going in a straight line 3 dimensionally, but it would be curved 4th dimensionally.
626822
The Universe is expanding, but it doesn't have a phyiscal start, middle, or an end.  It's going to expand forever. Don't think about it, because it's not something our mind can really grasp.\n\nHere's an analogy that helped me:\n\nImagine the Universe as a two dimensional place.  The Universe is the surface of a rubber ball.  There's no start, finish, or middle.  As the Universe expands, the rubber ball fills with air.  Still no start, finish, or middle.\n\nFor a long time, it was unknown whether the Universe was open or closed, meaning whether the Universe would expand forever or eventually collapse back on itself back to nothing.\n\nThe hubble telescope proved that the Universe it open and would expand forever.
1056226
The Universe cannot be infinite, because it is expanding, which points to its origin where everything began at the same point, namely the singularity of the Big Bang.  Therefore, if it is expanding, it is bounded.\n\nHowever, it is thought that it probably doesn't have an edge, much like the Earth doesn't have an edge.  If you started in a spaceship and went in a straight line, you would eventually end up where you started, much like if you started at the North Pole and went in a straight line, you would end up back the North Pole.\n\nThe reason: although you would be going in a straight line on the 2-D surface of the Earth, that line is curved in the 3rd dimension.  So, if spacetime is curved in the 4th dimension, you could be going in a straight line 3 dimensionally, but it would be curved 4th dimensionally.
349458
There currently is a "limit" to space; however, the universe is still expanding from the Big Bang, so the edge of space is constantly moving away from a central point. Beyond this, there is nothing, but unfortunately, this is almost impossible for our brains to conceive because the laws of physics that make up our known world do not exist outside the known universe.