4.5 billion years ago, an object the size of Mars crashed into Earth, blowing out enough material to form a companion sphere, the Moon. Within weeks, scientists believe, this material reassembled itself into a clump, and a year later it formed the spherical rock we know now as the Moon.
Most of Moon’s material, it is thought, came from the Earth’s crust, not it’s core, hence why the Moon has so little iron while the Earth has plenty.
Found in: Bill Bryson, A Short History Of Nearly Everything
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- Never stop Exploring – Why do we study the Moon? (earthandsolarsystem.wordpress.com)
- NASA Reportedly Considering Proposal To Give The Moon A Smaller Moon Of Its Own (geekosystem.com)
- The Moon and Phases for 2013 (astronomyataglance.wordpress.com)