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Posted by Julia
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 How did the moon form? The "big whack" theory suggests that a Mars-size
object slammed into the hot early Earth. The debris that was ejected
went into Earth's orbit and gradually came together, forming the moon,
the widely accepted theory says.
A new lunar-rock study suggests
that the moon's insides are a lot like Earth's—new evidence that the
theory of the big whack is on the right track.
Illustration courtesy NASA
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SPACE 
January 11, 2007—
