Take way everything in the universe and be left with nothing. Well except there can never really be nothing. At the zero-point energy, or the ground state of the Universe, isn't actually a state of zero energy. On the contrary, it's a finite, positive value not only that but a universe of nothing still has a size, a shape and it is still a physical object. The concept of nothing is very hard for scientist to understand because there is truly never nothing. By having nothing you actually have something . If you were to take a vacuum and suck all the particles up and be left with nothing, you wouldn't be left with nothing. You'd be left with gravity. Gravity can never be truly taken away because space and time is really gravity. The universe is said to be made from nothing which makes everything you see nothing, and nothing every thing you see, think about that for a while.