If the parallel universe theory is correct what would happen if two parallel universes collided?
916336
the theory is not correct so it will not happen, the truth is that the universe is flat, but curled up at the edges, I saw it through my telescope last night
1149831
So far our observations are leaning more towards open, because our universe is expanding at an accellerating rate, and it shows no sign of slowing, if it were closed (which we havent found enough matter in the universe to help this theory) then the expansion would slow, come to a stop, and come back and collapse back in on itself. But so far evidence is telling us it won't.
60140
The multiverse. And current theory states it is possible.
44594
the last day of the previous universe (assuming the previous universe collapsed into a singularity, and then exploded into this universe)
486453
By definition, parallel lines can never intersect or meet.\nParallel universes, if they would exist, must behave similarly to be truly parallel.\n\nConsider: If parallel universes were to be within a few billion light-years of each other, they would eventually be drawn toward each other. Result: No longer parallel.
303178
I have no idea. But in 1915 Einstein and some other people came across a problem with relativity - that it lead to some issues with conservation of energy and they starting thinking that possibly parallel universes could be the answer to correcting this.
172469
Think of them not as linearly parallel but Trans-dimensionally apart/separated.   See the Inflationary Theory/Model of the Universe for more detailed explanations.   ...And if you need help with the Math/Physics of it just give me a call in Universe # 91234536544232329767543.  :-)
668487
Ok, the parallel universe theory is a theory that some quantum physicists believe. The reason we have no detected them as of yet is because we can only detect forces and our forces would probably not be able to travel between the dimensions. In one version of string theory gravity is able to travel between the universes. If this is true we should be able to measure small fluctuations from the predicted value of gravity. So far they have tested this ont he scale of tenths of centimeters. There has been no evidence yet that there are parallel universes. If we get better equipment and we can measure that gravity does not follow newtons equation that may prove the existence of a parallel universe. I hope that helped
1130560
According to the current going theory on the creation of this Universe (the Membrane Theory), it was caused by the collision of two others, and that they were only two out of an infinite number... so I would say it's likely there are not only other Universes out there, but other multi-verses out there.  After all, if our Universe isn't the end of existence, what're the odds the Universe it's only a part of is?\n\n\nFor a bit more on Membrane theory, though admittedly not a lot since it's very new, you can visit:\n\nhttp://www.bbc.co.uk/science/horizon/2001/parallelunitrans.shtml\n\nhttp://www.citebase.org/cgi-bin/citations?id=oai:arXiv.org:hep-th/0312321\n\nhttp://www.curledup.com/parallel.htm
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.
10073
The size of the universe in terms of length, width, height, time is in a state of flux. At any instant it may be expanding or contracting. The universe is generally accepted to be currently expanding. \n\nM Theory (the conglomeration of the 5 superstring theories) tells us that the universe is the result of, so called, “membranes” colliding in such a way that create a pocket of space which we call the universe. If M Theory is accurate, it is probable that there are many universes just as there are many planets, solar systems, and galaxies. \n\nFor more information:\nhttp://en.wikipedia.org/wiki/M_theory
1106396
err the big bang was not really a a collision of matter. All mass and energy in the universe existed at a sigularity, or a dimensionless point. The Big Bang simply expanded and inflated it.
721615
Parallel Universe is a term used in science fiction, and in descriptions of some concepts in physics.  There is no Parallel Universe Theory.\n\nThere is something in physics called the "many-worlds interpretation" of quantum mechanics.  This has to do with the awkward problem of how we interpret what happens to things from the moment a certain kind of event occurs to when we make an observation of it.  Some events are completely random ... such as when a particle of a radioactive material decays.  So lets say you have a radioactive substance in a box, and if it decays, this causes a poison to be released which kills a cat in the box.  (This is the famous "Schrödinger's Cat" thought experiment, and nobody actually *does* this experiment and kills a cat ... it's just a hypothetical exercise.) Let's say the odds are 50-50 that the particle decays.  Before we open the box and look inside, is the cat alive or dead?\n\nSome people would say that the cat is *both* alive and dead.  The technical term for it is that the cat is in a 'superposition' of two states, both alive and dead ... and the cat 'collapses' into one state or the other at the moment we open the box.  This is the dominant interpretation.\n\nBut a different interpretation is that, at the moment of decay, the world splits into two realities ... two worlds or universes you might say.  In one world, the cat is alive, in the other the cat is dead.  As you are part of the world, you too get split into two versions.  One version is in the world with the dead cat.  The other version of you is in the world with the live cat.  It is not until you open the box that you know which version of the world you are in.\n\nHow does this affect your daily life?  Well, it's possible that some decisions you make (small ones, like what you had for breakfast, whether you wore the red shirt or the green shirt ... basically decisions that are more a matter of whim rather than much thinking or logic) are affected by random effects in your brain.  If so, then the world may have split into two parallel worlds at that moment.  Maybe putting on the red shirt made you slightly more noticeable at and that cyclist that *almost* hit you, in a parallel world actually did crash into you and sprained your ankle.   Science fiction stories and movies love to play with this stuff.
410246
Well, this is uncertain. I will explain it as it is currently understood. There are three possibilities based on relativity and the Standard Model. There are three types of expansion depending on the mass-energy density of the universe - open, flat and closed.\n\nIn an open universe, expansion will continue and will actually increase with time. This is because there is not enough mass and energy in the universe to pull it back in.\n\nIn a flat universe, the universe will continue to expand, but expansion will begin to slow at a certain point and as time approaches infinity the expansion will stop. Of course, since infinity means forever, the expansion will continue but slow down constantly, little by little.\n\nIn a closed universe, there is enough mass and energy to cause a collapse of the universe, known as the "big crunch."\n\nAnyway, current theory holds that we live in a flat universe and that inflation will continue forever, as mentioned.\n\nOh. It expands into nothing - as in before the universe is there, there is nothing there.
439684
If you follow the link provided, the video entitled "The Wild West of Physics" will hopefully describe the modern physics string theory that predicts the existance of parallel universes. If you need any more information, try googling "Brian Greene." He was not the first to develop string theory, but he was the first to explain it in lay terms. Or, checkout his book, "The Elegant Universe," from the library. It's really an easy read.\n\nBasically, parallel universes explain why gravity is so weak compared to the other forces of nature – electromagnetism, the weak nuclear force, and the strong nuclear force. It is suggested that gravity is weak because it travels between parallel universes. So, as Brian Greene suggests, it may be possible to “talk” to aliens in parallel universes using gravity waves. Gravity waves were predicted by Einstein, but no one has discovered them…yet.\n\nSo far as aliens, if you are referring to green men from Mars, no one has found any hint of intelligent life. So far as alien bacteria, there have been a handful of claims of alien bacteria inside metorites, but these claims have been met with skepticism.
104718
well... the universe is not infinite or so say today's scientists. according to the parallel universe theory,there are various universes and our's is one of 'em . well one cannot really define the *length* of a universe because it is almost impossible to percieve something that big for the human mind.
757860
One of the latest theories (not widely accepted) is that it was caused by the interaction of two other universes at the sub-atomic super-string level. This collision caused a catclysmic explosion at a  point of singularity, creating all the matter and energy we now have in our universe, which then began to expand and cool. \nSimple isn't it?\n\nAnother theory is that the universe is a state of perpetual pulsation. It expands, and then crashes in on itself to a singularity point, and then explodes again, this has been going on forever.\nEven simpler isn't it?\n\nThis could explain why so many people believe in God. It is simpler to understand. \n\nWhich theory you believe is up to you.