Moon was born when Earth and Theia smooched 4.5 billion years ago

June 6, 2014 6:13 AM

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Moon was born when Earth and Theia smooched 4.5 billion years ago

Apollo rocks, like this one from Apollo 15, appear to have different chemical compositions than those on Earth, lending evidence to the idea that an impact 4.5 billion years ago created the moon. (Photo : NASA)

Apollo rocks, like this one from Apollo 15, appear to have different chemical compositions than those on Earth, lending evidence to the idea that an impact 4.5 billion years ago created the moon.

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