History of the Moon's Surface
This suggests a possible history.
- 4.6 billion years ago, the magma ocean.
- 4.4 billion years ago, crust starts to form.
- 4.4 to 4.0 billion years ago, era of the highlands
- crater formation.
- lava flows.
- some craters were giant.
- 3.8 to 3.1 billion years ago, maria formation
- lava flows into the giant craters.
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Davison E. Soper, Institute of Theoretical Science,
University of Oregon, Eugene OR 97403 USA