Physical Evolution of Earth
Big Bang led to generation of our solar system and primitive Earth
According to current theory, before the big bang, all matter in the universe was concentrated as a point-source of infinite mass ... a gravitational singularity
13.7 (+/- 0.17) billion years ago (Ba), this infinitely massive point-source exploded, very rapidly expanding the matter to ever-enlarging volume, spewing intense radiation and energy (recent evidence indicates that this process may be a recurrent one, with cycles of expansion followed by contraction followed by big bangs)......http://goo.gl/HqHOn
