Science Matters by Robert M. Hazen

Author:Robert M. Hazen [Hazen, Robert M.]
Language: eng
Format: epub
ISBN: 978-0-307-45664-9
Publisher: Knopf Doubleday Publishing Group
Published: 2009-01-23T20:00:00+00:00

The Formation of the Moon

Earth’s solitary, lifeless moon provides a striking contrast to our dynamic planet, and its origin has long posed a problem in the theory of Earth’s formation. The moon has roughly the same chemical makeup and density as Earth’s mantle, so it looks like a piece torn out of our own planet. The prevailing theory for the moon’s origin is that some millions of years after Earth formed, one last giant moon-sized asteroid crashed into Earth, throwing a lot of material into orbit. The moon then formed from this loose material by a process similar to the original formation of Earth.

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