Question

why planets are round?

Answer 1

Gravity. If they were cubical the corners would have a higher potential energy than they could have if they were closer to the edges, so they have the propensity to move closer to the centre of the planet with a slight 'push' (wind, meteors etc.).

Answer 2

Things tend to go from high to low potential energy.

Answer 3

This is all because gravity is spherically symmetric.

Answer 4

http://www.scientificamerican.com/article.cfm?id=why-are-planets-round

Answer 5

mountains fall down

Answer 6

( whep ... here we go ) using the " big bang theory " after this great explosion of paricles whitch we will call group1 move the the newly formed space and begin expansion of said space .. now come group 2 more particles moving in a great space allowing particles form group 1, 2 .. and soon 3 ect ect ect to ( excuse the phrase ) bump in to and clump togeather ( see newtons law every object is attracted to every other object ) this bumping arround , clumpiong togeather gives us a rotation , and a small amout of gravity , thus pulling in more particles ... the round shape is and extension and a repisention of not only the particles themselves but to the force of gravity set on to the by theslves and other budies of gravitational force ...

Answer 7

is not this a phenomenon of surface tention when planets were in liquid state.