How come all the planets in our solar system are round?
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Answer:
I'm no scientist and don't profess to know the answer, but isn't it because of the spinning and gravity?
That's how planet formation works, most dense at the center, gradually decreasing (works out to create a sphere), of course they're not perfect circles but the overall shapes are the same.
When a object becomes massive enought it's gravity overcomes ridiged body forces and pulles it's self into a ball. This state is called "Hydrostatic Equilibrium"
http://tech.groups.yahoo.com/group/neata...
Gravity pulls them into a sphere and rotation flattens them slightly and makes them bulge at the equator.
The gravity of the planet smooths any corners or bulges, once it gets beyond a certain size. It's called Hydrostatic equilibrium. (BTW none of the planets are perfect spheres, their rotation makes them bulge at the equator.)
Because of gravity, its as simple as that.
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