Big Bang Theory
...of space with infinite temperature, pressure, and density. This theory is well supported and there are many reason for it's support. One main reason is that no one really has a clue and The Big Bang Theory seems far fetched but more reasonable than any other ideas that there are out there. Some of the important thing to know about the big bang to understand are the beginning and the few seconds immediately after the actually bang. Also what generally has happened since the then. It is important to know theories of how it will end as well, and to get a well rounded opinion, I feel it useful to have some of the other possibilities outlined. The best place to start is the beginning.
One of the things that cosmologists are not yet sure about is the Big Bang itself. It is not yet possible to give a definitive answer to the questions: what was the Big Bang and why did it happen? However, there has been a great deal of speculation recently on this subject, and it may not be long before a definitive, or almost definitive, answer will be declared. For the moment we will simply take the Big Bang as it is given, a huge explosion in which time and space began expanding. It is important to realize that space itself originated in the Big Bang. IT is tempting to think of the universe before the Big Bang as being a vast, infinite, expanse of empty space, like the space between the galaxy clusters today. The Big Bang, then, would have flung matter into this nothingness, but this is not what happened. Space itself was created during the Big Bang. Einstein and all subsequent cosmologists have viewed space as being as real as matter. In fact, physicists now view empty space as a sea of "virtual particles". So space is now expanding along with the galaxies and stars that exist with it and has been expanding ever since the Big Bang.
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