Science Focus
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You probably know: Earth's moon likely formed after a planet-size object collided with Earth about 4.5 billion years ago.
BUT DID YOU KNOW: The birth of the moon might have given us our 24-hour day.
One lingering question scientists have about the impact-birth theory: Why are the Earth and the moon made out of the exact same stuff, geochemically speaking? Why doesn't the moon contain material from this mysterious impactor?
In 2012, Harvard scientists Matija Cuk and Sarah Stewart offered a new vision of the moon's formation with one new key element: a fast-spinning Earth. At the time of impact...
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» see original post http://theweek.com/article/index/264929/9-things-you-probably-didnt-know-about-the-moon
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