Anyone can tell the definition of Big Bang shortly?

Answer 1

I think you mean briefly

Answer 2

The universe started out as everything crammed together in a tiny space. It was so hot that there was only energy, no matter of any kind could exist. It expanded rapidly. As it did so it cooled and matter formed. Later some of the matter pulled itself together by gravity and created stars, planets, and galaxies.

The most compelling evidence we have that this theory is right is that the universe is filled with the afterglow from that beginning. It's microwave radiation, with tiny ripples that are left over from minor irregularities in the early universe that created stars. Careful measurements of those tiny ripples by sophisticated satellite instruments have convinced almost all astrionomers that this theory is correct.

Good book about it:

http://www.amazon.com/Afterglow-Creation-Fireball-Discovery-Ripples/dp/0935702407/sr=1-1/qid=1158301517/ref=sr_1_1/104-7410642-9107907?ie=UTF8&s=books

Answer 3

very briefly, it's a theory that scientists have on how the universe was first created. From a point (singularity) all matter in the universe moved away from it creating the "expanding universe" (what scientists are studying now). It wasn't necessarily an explosion.....I hope that helps a little... check out www.astronomyplace.com it's really good

Answer 4

A very long time ago, everything was sucked down into a little speck. The laws of physics as we know now didn't apply. It blew up with huge force. We are part of it and we are still expanding outward from the universal belch.

Answer 5

Out of nothing came everything and everything ends up as nothing. BANG!!!

Answer 6

gases and chemicals floating around in empty space came together, chemically exploded and blammo, instant universe.

Answer 7

BANG