before the big bang

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i think that they may of been a time before the big bang
a galxay could end then a new one is formed in its place
that what could happen to us (in a few billon years)

please reply on this.
thanks

mmcool, you're confusing your terms. A galaxy is a collection of stars, usually numbering in the hundreds of millions or more. There are estimated to be approximately as many galaxies in our universe as there are stars in our galaxy (on the order of one hundred billion). Galaxies form, are dispersed, and form anew; our Milky Way galaxy may or may not survive collision with the Andromeda galaxy, some five million years from now. (Don't worry too much about our Sun; galaxies are mostly empty space and dust, and the odds of our own star colliding with one in the Andromeda galaxy during the interaction are vanishingly low.)

"What happened before the Big Bang?", however, is a question for philosophers and theologians, not scientists. Science concerns itself with the observable universe, and almost by definition you cannot observe anything "before" the universe came into being. One cannot even be certain that the term "before" has any meaning whatsoever in those circumstances - "before" implies the existence of time, which seems inextricably intertwined with the existence of space, so how could there be a "before" space existed?

Tales of 11-dimensional brane collisions are not "theories", they are hypotheses. Brane "theory" cannot be experimentally proved or disproved - scientifically, it's what we call a "non-falsifiable hypothesis" (one that makes no predictions that can then be proved true or false), unless we were to find the Higgs boson at the LHC and prove whether or not it interacts with neighboring branes to produce gravity. (Personally, I'm kind of hoping the Higgs is found, but is shown to only interact with our universe - that implies the ability to modify or manipulate the Higgs field, which would imply the possibility of anti-gravity and controlled artificial gravity.) The same holds for the Copenhagen interpretation of quantum mechanics, sometimes called "multiverse theory".

To work that one out, theoretical physicists must come up the way to reconcile quantum physics with general theory of relativity. The thing is both feature alternative universes in both general relativity and the possibility of what's on the other side of a black hole and other rips in spacetime fabric and the other featuring alternative universes in quantum physics and in some kind of probability wavefunction which may be an explanation for the fuzzy nature of Heisenberg Uncertainty Principle which means you can't know a particle's position and momentum simultaneously. You can know one but that increases uncertainty about the other property. One interpretation says that the collapse of the particles wave function would cause that to assume properties that are observed. That is the Copenhagen interpretation of quantum physics. Another interpretation of quantum physics states that each observation of a particle causes the universe to split into two or more parallel universes an electron in an atom exist as a probability cloud is because it i in all parallel universes simultaneously. That being the many worlds interpretation of quantum physics as developed by Hugh Everett III in 1953. The bringing together quantum physics with Einstein's General Theory of Relativity and possibly remove the birth of the universe singularity and therefore the possibility of black hole singularities. This involved developing some kind of quantum theory of general relativity or quantum gravity by using higher dimensional geometry which is very complicated mathematics. Two contenders for this theory would be string theory or M theory which makes sense using ten dimensions and may be two or more time dimensions. These dimensions would be compactified to about the Planck length in size and shorter than that makes no sense because physics breaks down at lengths shorter than 10^-33 centimetres, the Planck length. At the Planck time about 10^44 second all interactions were at equal strength. All ten or 11 dimensions were of equal size an then after that four of the 10 or 11 dimensions expanded these are the 3 of space and Albert Einstein's fourth dimension. The 11 dimension makes trings stretch out into membranes or 'branes' for short and what happens when these 'branes' collide? it is postulated that it makes 'big bang' like the one which started this universe. Under M theory a lot of universes an infinity of them in 11 dimensional superspace. Another theory is that the universe is the product of a previous universe running in reverse.. That one towards a 'big crunch' causing our big bang. But then again I am not a physicist.