Actually, there’s a finite amount of air in the pit, but it’s not falling. It’s already settled around the planet’s midpoint. The pit keeps going forever, but gravity starts pulling the other way after a while
A hole through a planet is not a bottomless pit. Like any normal hole, it is bounded on both ends. A bottomless pit has one bounded end and one unbounded end.
Actually, there’s a finite amount of air in the pit, but it’s not falling. It’s already settled around the planet’s midpoint. The pit keeps going forever, but gravity starts pulling the other way after a while
A hole through a planet is not a bottomless pit. Like any normal hole, it is bounded on both ends. A bottomless pit has one bounded end and one unbounded end.