Why Are All Planets Round?

I've noticed that all planets in space are round. I have never seen any planets that have other shapes and I find it interesting that they all look like spheres.
I wonder why we never see a planet that looks like a square or a triangle, why do they have to be all round?
Is it because some physics law that we were supposed to be taught at school? Because no teacher ever explained to me why the planets are all round and not other shapes.

asked by Sam in Astronomy & Space | 2064 views | 01-03-2012 at 10:25 PM

Planets are round because the gravity that is present in the space. Basically, they have a gravitational core at the center that pushes every particle to a single point that's located in the exact center of the celestial body.
That means that any particle that is loose in space, is sometimes attracted by a planet and it's then pulled to the center. This keeps their round shape.
All planets are round for the same reason. You can read any book about astronomy and this is basically the explanation that you'll get.

answered by Charles | 01-03-2012 at 10:30 PM

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