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Earth May Once Have Had Two Moons 139

AaronW writes "According to a story at, 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."

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When speculation has done its worst, two plus two still equals four. -- S. Johnson