Is there a boundary for this universe ?
468467
There is no boundary as such because there is "nothing" beyond the edge; but the Universe in not infinite.  Difficult to get your head around I know especially as "nothing" in this case does not mean nothing as you understand it now.  If I go on you might blow a fuse so I will stop there.\n\n[re: above - "The Milky Way" is the name of our Galaxy not our Solar system]
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.
264754
Think of the universe as a giant bubble. Outside the bubble is nothing. nothing exists. no space. no time. Even though there is an edge to the universe, you cant reach it. If you started at the earth and went in a straight line. you would eventually come back to the earth. Also, we are not the only universe. there are other bubles. too. they are in the same nothing as ours. But you could not travel to other universes.
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.
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.
26407
Well, according to most theories, the Universe does not have a 'wall', if by wall you mean boundry.  However, solar systems do have a 'wall'.  This wall is called the heliopause, and marks the boundry where a star's solar winds fade into the interstellar void (the space between the stars).  Any object passing through the heliopause is believed to experience a termination shock.  This is caused by the preasure difference between the solar winds and the void NOT because the object is actually hitting a wall or other physical barrier.  Today, many theories also (as the previous post mentions) suggest that the Universe is both finite yet boundless.  What does this mean?  First, 'finite' means that the Universe is not infinate in size (theoretically we could then assign a number to the its size, much like we assign a number to the size of a piece of land).  However, the Universe has no boundries - it is 'boundless'.  How can something have a finite size and no boundry?  One theory is that the Universe has a shape like a ball.  Imagine you are a tiny person walking on the surface of a basketball.  Assume you can only walk and not fly, jump, etc. No matter how much you walk in any direction, you'll never find an 'edge' (to you, the basketball has no boundry).  However, if you remove the skin from the basketball and lay it flat, it is apparent that the basketball _does_ have a finite (limited) size.  It's hard to imagine it, but picturing the Universe 'flat' and 'wrapped around' itself in a ball (a closed Universe) will allow you to have a Universe without boundries, but with a definate size.  Our minds are not equiped to visualize objects beyond the 3rd dimention (for example, we can't 'see' space-time), so most modling of the Universe makes the most 'sense' when done in calculations.
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.
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.
235823
I would say that there is no edge. The matter in our solar system is constantly being pulled and shifted by gravity fluxes, and if you were to drift further out you would run into another solar system similar in design to ours, just varying in scale. Because as humans we can only fully understand information that has a start and finish does not mean that there are borders to all things.
412853
First off you have a real good question.  As a matter of fact I used to think like this during my high school years.  \n\nInfinity in cosmology\nAn intriguing question is whether actual infinity exists in our physical universe: Are there infinitely many stars? Does the universe have infinite volume? Does space "go on forever"? This is an important open question of cosmology. Note that the question of being infinite is logically separate from the question of having boundaries. The two-dimensional surface of the Earth, for example, is finite, yet has no edge. By walking/sailing/driving straight long enough, you'll return to the exact spot you started from. The universe, at least in principle, might have a similar topology; if you fly your space ship straight ahead long enough, perhaps you would eventually revisit your starting point.\n\nIf the universe is indeed ever expanding as science suggests then you could never get back to your starting point even on an infinite time scale.
906367
There is nothing called the end of the Universe. There are three possibilities of the shape of the Universe.\n\nFirst, the Universe might have what we call positive curvature like a sphere. In this case, the Universe is called "closed" and it has a finite size but without a boundary, just like a baloon. In a closed Universe, you could, in principle, fly a spaceship far enough in one direction and get back to where you started from.\n\nThe second possibility is that the Universe is flat. This kind of Universe can be imagined by cutting out a piece of a baloon material and stretching it with your hands. The surface of the material is flat and not curved. You can expand and contract it by tugging on either end. Flat Universes are infinite in extent and have no boundaries.\n\nFinally, the Universe might be "open" or have negative curvature. Such Universes are also infinite in spatial extent and have no boundaries.\n\nThus whatever be the shape of the Universe, there is nothing called a boundary and hence nothing called the edge or end of the Universe.
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.
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.
1094356
It means that we can measure the size of the universe, but if you tried to approach an "edge" of the universe, all you would do would be to extend it. Wherever you go, the universe goes with you, so it is unbounded. You cannot go "outside" the universe.
183513
There is disagreement over whether the universe is indeed finite or infinite in spatial extent and volume.\n\nHowever, the observable universe, consisting of all locations that could have affected us since the Big Bang given the finite speed of light, is certainly finite. The edge of the cosmic light horizon is 13.7 billion light years (4.19 Gpc) distant. The present distance (comoving distance) to the edge of the observable universe is larger, due to the ever increasing rate at which the universe has been expanding; it is estimated to be about 78 billion light years (7.8 × 1010 light years, or 7.4 × 1026 m). This would make the comoving volume, of the known universe, equal to 1.9 × 1033 cubic light years (assuming this region is perfectly spherical). The observable universe contains about 7 × 1022 stars, organized in about 100 billion galaxies, which themselves form clusters and superclusters. The number of galaxies may be even larger, based on the Hubble Deep Field observed with the Hubble Space Telescope. The Hubble Space Telescope discovered galaxies such as Abell 1835 IR1916, which are over 13 billion light years from Earth.\n\nBoth popular and professional research articles in cosmology often use the term "universe" when they really mean "observable universe". This is because unobservable physical phenomena are scientifically irrelevant; that is, they cannot affect any events that we can perceive. See also Causality (physics).
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.