Earth May Once Have Had Two Moons

AaronW writes "According to a story at space.com, Earth may once have had two moons. The smaller moon, estimated to be 750 miles (1200km) wide and only 4% of the mass of the larger moon, crashed into the far side of the larger moon which caused the features we see today on the moon. The surface of the far side of the moon is quite different than the side facing the earth, having a different composition and a much rougher terrain."

Earth may once *have* had two moons.

[chaboud]

Serious guys. You learn read book now. Thanksbye.

2 moons?

[margeman2k3]

That's no moon...

Re:Question for those more knowledgable than I

[bberens]

When you consider the gravitational field rather than line of sight then the "shadow" that Earth casts is really quite large.