dave_hitz t1_jbfgcfu wrote
Reply to comment by fish4096 in TIL the largest moon in our solar system, Ganymede, is larger than the planet of Mercury by Jugales
Big enough for gravity to squeeze it to round. Most asteroids are odd shaped rocks. They don't count. Get enough rocks to generate enough gravity to pull the rocks into a sphere, then you've got a planet.
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