When asteroids made the earth how did the earth become round?

The earth wasn't round to begin with in the early stages of its life, however over billions of years as the earth gradually got bigger, gravity started to increase and slowly it started to pull the earth in from its centre. If large mass is forced into one singular point it will condense and all try to get to that one point thus becoming perfectly spherical.

Any denser material will do the same however it will win and sink to the core hence why the earths core is made from molten metals and even diamond. This however hasn't been fully proven and there is no definite answer as to what elements are at the core of the planet.

As to the other persons answer he will find himself very much mistaken and I recommend that he actually does a little research into theoretical physics as clearly he has not. Galaxy's are simply matter that has 'clumped' together from massive dust clouds, this is due to gravity. All this matter is all coming from one point and expanding, the only difference is rather than the universe expanding as a big cloud of dust it has condensed into galaxy's full of billions of stars and planets.

There is still called The Big Bang Theory as we can not fully prove it and probably never will however it is the best guess we have and it is the theory we have most evidence for. The evidence for the existence of god however comes from a book that was written over a thousand years ago and we can already disprove a lot of those theories.

As to what to believe people may believe what they like however I think people need a more open mind when it comes to other theories.

Alex