New study confirms the moon is older than we realized. Scientists have shown that a "remelting event" more than 4.3 billion years ago "reset" the internal clock of most lunar rocks, which has helped obscure the moon's true age.
A ‘remelting’ of lunar surface adds a wrinkle to mystery of Moon’s true age - EurekAlert
A 'remelting' of lunar surface adds a wrinkle to mystery of Moon's true age
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