Board Thread:Fun and Games Forum/@comment-24510587-20170610185933/@comment-4957456-20170620202615

(The reason the inner core is solid is the immense pressure on it due to the tonnes of rock and magma above it which is pulled towards the centre by the gravity of the core and of the mass of the rock and magma on the opposite side of the core. However, because it's surrounded by more-or-less equal mass on all sides, the core feels no gravity besides that of other celestial bodies. On Earth, the acceleration due to gravity actually peaks around the boundary between the mantle and the outer core, because the core is where all the mass is. See this graph.)

"We would be crushed if you considered the planet's as a particle at the core, which is a reasonable assumption of we're considering forces at the surface," Avori's Ghost responded. "But since the planet is actually a large sphere, that model doesn't work well once we go significantly deep underground."

"Regardless," Avori said, shushing his Ghost before he continued. "It certainly is an effective safe house, and one which will likely prove very hard to infiltrate. Anyone have any ideas?"