Lets say you took quantity of mass equivalent to the earths mass and through some kind of unbelievable technology formed it into a solid shaft ten miles in diameter and X miles long. How big is X?
Now, once you have that shaft, is the gravity felt at the ends stronger than if you were standing on the side in the middle? It seems like you would have all that mass lined up below you when you’re at the end whereas you’d only have ten miles of mass below you at the middle. So it seems like the shaft is generating a gravity “beam” from each end. Or does the shaft as a whole still retain the 1G level of attraction in all directions?