The basic question is about how dynamic is hydrostatic equilibrium.
In reading about TNOs and KBOs, one of the parameters for them is that they have relaxed into hydrostatic equilibrium, or that gravity has forced them into a predominantly spherical shape. Then, of course, one sees a depiction of Haumea, which is thought to be ellipsiod but spinning so fast that it stays that way. So that got me to wondering.
Go to Mars, which is thought to be all solid, taking one of those tunnel borers and a really, really long auger for clearing the “dirt”. Assume that this is an exceptionally good borer that can make short work of solid rock. Digging a twenty foot wide hole straight down, can you make it to the center of the planet before the hole gets squeezed shut?
How fast would you have to go, could you pull the borer all the way back in time? If you could dig a widening hole (larger deeper), would that work? In a smaller, round body, might it be possible, and if so, is there a size limit?
I mean, I just want rocks and stuff.