Until the Republicans decided that we could no longer afford two moons, and cut it back to one. From the Guardian:
The remnants of a second moon that orbited the Earth billions of years ago may be splattered across the far side of our moon, scientists claim.
The two moons are believed to have been created at the same time and followed a similar path to the moon we're familiar with today, but after tens of millions of years of peaceful co-existence, the two appear to have crunched together in a gentle collision that left the smaller, just a third of the size, spread across the larger like a cosmic pancake.
Researchers put forward the idea after computer simulations found that a collision with a second, sibling moon in Earth's early history might solve the longstanding puzzle of why the two faces of the moon differ so dramatically.
