Hi all, I am very new to this forum so please let me know if I have posted this in the wrong place, and thanks in advance for any replies :) Backstory: My friends and I were playing a game called Portal in which you can place two portals (each of which leads to the other). We were discussing what you could do if you placed one portal right above the other (ie, one in the ceiling and one in the floor) and then began to fall through. From there, the conversation led to what would happen to a person falling through the portals in a vaccuum (therefore ignoring air friction). Question: What would happen to a person as they approached light speed at the acceleration of gravity? Assume for the sake of the question that this person does not need to eat/breathe/sleep/etc, and that the portals are matterless and do not produce any sort of friction. Thanks again!