[GodGunsGuts]

They should call it the cobweb moon.

[GonzoGOP]

Ganymede is literally (craters per square mile) the most bombarded place in the solar system. The extra heat that keeps the core liquid might be from it getting smacked around so much. When Earth got smacked in the Moon forming event (admittedly that involved being hit by something size of Mars) it liquefied the entire planet. We still haven’t solidified from that smack more than a few miles down. Does that mean that the solar system is only as old as the moon? No it just means that the age of a planet is only the time since the last time it got resurfaced.