Earth had two moons that collided to form one: study

two moons

This diagram shows a simulation of four stages of a collision between the Moon and a companion moon.

There may have been a tiny second moon that had once orbited Earth before catastrophically slamming into the other one.  The clash of the two moons could explain why the two sides of the surviving lunar satellite are so different from each other, according to a new study.

 

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