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accretionary impacts, and core formation. The abundance and short half life of aluminium-26 allowed it to function as one of the sources of heat for the melting of planetesimals. With aluminium-26 as a heat source, planetesimals that had accreted within 2 Ma after the formation of the first solids in the solar system could melt. Melting in the planetesimals began in the interior and the interior magma ocean transported heat via convection.

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