Hypothetical
If there was a hole through the middle of the earth, leaving nothing but air from one end to the other, what would happen if you fell in? Say that the heat from the core would not kill you. Would you fall through to the other side, or would you become stuck in the middle?(thank you hopper !)
Say you're driving in your car, in outer space, traveling at the speed of light. If you turn on your headlights what will happen ?