Did Earth have two moons?

Some astronomers believe our moon had a smaller sibling for 80 million years — before it was destroyed in a violent collision

Did Earth have two moons?
(Image credit: NASA/Roger Ressmeyer/CORBIS)

The moon once had a smaller sibling, according to astronomers from the University of California, Santa Cruz. The researchers used computer models to simulate the size, orbit, and ultimate destruction of the second moon that they believe once shared the night skies above our Earth. But what became of our second moon? Here, a brief guide to the new theory:

Where did the second moon come from?

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