[Smellin Salt]

Why then are the earth and moon both round? One would think if they were the result of some cosmic collision, they would be shaped accordingly.

[circlecity]

"Why then are the earth and moon both round? One would think if they were the result of some cosmic collision, they would be shaped accordingly."

Perhaps planet rotation does something to round them off over the millennia.

[Larry Lucido]

It was ground down into a ball by Kruger Industrial Smoothing.

[Bubba_Leroy]

Why then are the earth and moon both round?

Because they are large enough that their own gravity eventually pulls them into spheres.

Liquid or molten objects form into spheres fairly quickly, but even solid, rocky objects will form into spheres over the course of a billion years or so if they are large enough.

[soycd]

>Why then are the earth and moon both round?

Gravity makes things spherical.

[free_life]

If you spun around at 1040 mph, you would be round too! grin