Whitley’s book 2012: The War For Souls involved the inter-dimensional invasion of a parallel Earth that had a number of marked differences from our own, including one departure where that Earth had two moons. However, as life sometimes imitates art, our own reality has taken an odd step toward being a bit more like Two-Moon Earth, in that it has been found that we have a second natural "quasi-satellite" accompanying our previously solitary Moon.
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The Earth may once have had TWO moons–a smaller one and a larger one–which ended up crashing into each other, producing the single moon we have now. This would explain the mystery of why the near and far sides of the lunar surface are so different.

The near side of the Moon–the one we can see from Earth–is flat and cratered while the rarely-seen far side has tall mountain ranges. The impact would have made the moon lopsided and reoriented it so that one side always faces Earth.

In BBC News, Matt McGrath quotes astronomer Martin Jutzi as saying, "It was a rather gentle collision, slower than the speed of sound–that’s important because it means no huge shocks or melting was produced."
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