@karetaker said:
@Killemall: The "Big Bang" is commonly described as an explosion, but this is not really a good analogy. In fact, the universe was created through an expansion of space.
The Big Bang
In the big bang theory, the universe formed as a primeval fireball about 15 (or so) billion years ago. Initially the entire universe was compressed to the size of an infinitesimal point. At the moment of formation this primeval fireball began expanding and has been expanding ever since.
The initial expansion of this primeval fireball is almost universally described as a huge explosion. An explosion however is not the best analogy to describe this expansion. Why? In an explosion, such as a bomb or firecracker, matter blasts out from a central location and fills up space that is already there. The pieces of matter are moving away from each other because the blast gave them a large velocity away from the center of the blast.
Expansion but not Explosion
This is not what happened in the big bang. It is true that distant galaxies all appear to be moving away from us. That is not because we are the central point in the universe. It is also not because an explosion gave them a large outward velocity.
Are you getting this from a wiki, because else if this is written by someone credible you should flip him a birdie.
Firstly, law of matter conversion - anything that pass the speed of sound produces a sonic boom thats the first burst of energy outlet, so unless we are saying universe expands slower than the speed of sound, which simply cannot be correct, there has to be a bang.
Secondly, the only thing that this says is its not explosion because there was no space before big bang, which based on some theory is correct. that doesnt change the fact that a rapid expansion of a tiny extremely hot matter has to cause an explosion, because unless some matter are converted into energy the expansion is not possible from a ball of pure energy, so there has to be an explosion somewhere.
Also the only thing this article or whatever it is seem to say there was a bang its just not called explosion because the matters didnt go out in the space that was already there but the space itself was created through this process. There still has to be a bang somewhere, else its just big with no bang theory ;p
Log in to comment