[injidup]

A rather lethal 9mm bullet. Would it just punch right through the earth if it hit or would it stop and then eat the earth from the inside?

[mlnj]

it would just spagettify the earth long before it reaches the center.

[Smithalicious]

Would it? If it were one earth radius away from the surface it would exert as much pull on someone on the surface as the earth would, right? Things couldn't start becoming spaghetti before that point, and that's pretty close to earth; surely it'd reach the earth's center very shortly after that.