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Originally posted by Soylent Green Is People
I bet if an irregularly-shaped rocky asteroid suddenly turned fluid or even just a little more plastic, its gravity would eventually form it into a sphere (as long as no other forces were acting on it.)
Originally posted by IAttackPeople
In a word: Gravity.
Once a body reaches sufficient mass its own gravity, acting equally around the center of mass, will form the body into a spherical shape.
Of course, smaller bodies, like asteroids and comets, are all sorts of odd shapes.
[edit on 31-12-2007 by IAttackPeople]