If you created an infinite loop portal in a vacuum, what would happen?  Would the falling object eventually approach the speed of light?  Then what?,(reply>), @Damien Green Even with infinite energy, it takes an infinite amount of time for it to reach the speed of light. Imagine you are standing on one side of a room, and your goal is to reach the other side. The closer you get, the more resistance there is working against you. So you take a step and close half the distance to the wall. Then, you take another step and close the distance by half again, so now you're 3/4 of the way there. Then 7/8. Then 15/16. And so on. And no matter how quickly you take these steps (infinite energy), the resistance against you keeps building, so you never actually reach the wall in any finite amount of time. Only objects without mass (like light) ignore this resistance.,(reply>), @Corey Lando but what's stopping it from reaching light speed there is infinite energy from the portal thing.,(reply>), As it gets closer to the speed of light, the energy it takes to accelerate increased exponentially. Only something without mass travels at the speed of light (i.e. light and radiation).,(reply>), @karmakazi219 It would forever keep approaching the speed of light closer and closer but never reach it.