Quote Originally Posted by goti71 View Post
It's about hydrostatic equilibrium. Meaning that if a body has enough mass, it morphs into a spheroid shape. Like water droplets in if there was no air. Bodies that are big enough end up like that because of this effect (see the dwarf planets Ceres, Eiris, etc. They are all round, but smaller stuff just stays a potatoe forever, like mars' potatoe moons Phobos and Deimos).

Scroll down to check out Planetary geology.

https://en.wikipedia.org/wiki/Hydros...m#Astrophysics
When the Michelson Morley experiment failed to prove the relative motion of the earth and ether, they needed something to continue there lie, enter Einstein's theory of reactivity.