Nature Astronomy, Published online: 13 January 2025; doi:10.1038/s41550-024-02444-z

Ancient lunar basins that formed within about 100 million years after the lunar magma ocean solidified have fully relaxed, owing to the high temperature of the lower crust, and thus escaped detection. This finding explains the discrepancy between the number of basins detected on the Moon (~40) and the number predicted (~300) by an accretion scenario of planet formation.

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