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The Moon’s Violent Birth

A young Earth might have had a twin that eventually became our satellite.

RELATED TAGS: SOLAR SYSTEM
collision
The origin of Earth’s abnormally large moon is a long-standing mystery in astronomy. Most scientists believe our satellite formed from the remains of a small world called Theia after it smacked into Earth 4.5 billion years ago. Models show that chunks of the Mars-size interloper spun off and coalesced into the moon. So astronomers were puzzled when lunar samples returned by Apollo astronauts showed striking similarities to Earth rocks instead.
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