SETI Institute for Educators

earth moon collision

Forming the Moon from A Synestia: Brute Force Instead of Fine Tuning

It is generally accepted by most planetary scientists that the Moon was formed in a giant collision between a growing Earth and another, smaller, proto-planet at the end of Earth's formation, about 4.5 billion years ago. However, there is little agreement about the details of this collision and how exactly it led to the formation of the Moon.
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