How do planets become round?

Answer 1

For an object to become round, its gravity must be strong enough to overcome their rigidity. The size at which this occurs is different for each material it could be made of, but by comparing the size of the smallest rounded objects to the largest unrounded objects, a midpoint can be found; the moon Mimas has a mass of around 4 x 1019 kg and is rounded, where many asteroids ranging from 2 x 1019 to 4 x 1019 kg are not so. While this may be due to impacts and not their own characteristics, we could probably place the mass necessary for rounding to begin at somewhere around this mark.

Answer 2

They aren't round per say they are oval they get this shape because when they are young planets the magnetic fields are very strong thus the materials or masses present in the young planet get shaped or form according to the magnetic pull and has the planet cools down the magnetic pull and the liquidity of the planet decreases . Thus maintaining an oval shape

Answer 3

Planets become round due to the force of gravity pulling equally from all directions, which compresses their materials into a spherical shape. Over time, this force causes the planet to settle into a round form, as gravity is the dominant force shaping celestial bodies in space.