At around four and a half billion years ago, Earth received a collision from an object known as Theia. The recent discovery may be able to solve the question of how the moon was formed and why it is so similar to Earth.
Visit "The creation of Earth's moon" page in this site for more information
Citations
Websites
Space.com - https://www.space.com/19275-moon-formation.html
Nature (paper) - https://www.nature.com/articles/s41561-019-0354-2
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Wikipedia - https://en.wikipedia.org/wiki/Moon
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