If we were to take a region of space which had nothing in it, no particles, no light, just empty space, would this space contain energy of some sort? Also if space can warp, change, bend etc then can space be made of something? Like a material? If empty space is nothing then how can it bend or warp under the presence of mass? If we took all the energy out of the universe and then placed a planet in the universe, would there be gravity? If so does this not show that gravity is the result of a physical material being warped under the mass of an object? I just don't see how space can have characteristics if it isn't made of something. A number doesn't have any physical characteristics so why does space, which is nothing, which means it doesn't actually exist?