From Hanneke Weitering at LiveScience:
Earth’s moon may be the product of many small moonlets that merged after multiple objects as big as Mars collided with Earth, leaving disks of planetary debris orbiting the planet, a new study suggests.
This idea that multiple impacts led to the moon’s birth challenges the most prevalent theory of lunar formation, which suggests that one giant impact led to the formation of the moon. More.
See also: Space.com: Scientists finally know how old Moon is What’s surprising, really, is how little we know about the moon in general.
And various current theories:
Another moon origin theory: Epic crash
How the Moon Formed: 5 Wild Lunar Theories (Mike Wall at Space.com, 2014)
Our moon formed in collision with embryo planet?
Origin of the moon still shrouded in mystery
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