text: Science is not sure about the real nature of space. It's an old question: If you remove *everything* from inside a glass, would the walls touch each other? So can you remove space from inside the glass?\n\nIs a vacuum really empty? We know that there are on a quantum level things like so called vacuum fluctuations. The uncertainty of energy and time allows it for a very short ammount of time to borrow energy from nothing to create a pair of a particle and it's antiparticle, if they annihilate fast enough and give the "borrowed" energy back. This is experimentally confirmed and happens all the time.\n\nSo we can not create a vacuum as the "absence of everything".\n\nIn cosmology scientists had the idea of a "false vacuum" which would be a vacuum which is not in the lowest possible energy state. So you see even the word vacuum is not as simple as it seems.\n\nThe problem is, as you have realized: We don't know what space is made of, especially on a microscopic level. We need to "marry" quantum mechanics with Einsteins general theory of relativism, which would give a quantum theory of gravitation.\n\nUp to now no one was able to do that, there are some fundamental problems. But we have some approaches, one is for example the quantum loop theory which says that space on a very microscopic level has a foam like structure, another one are the super string theories, which say that particles are vibrating strings in a much higher dimensional space (the higer dimensions hve not "unrolled" and are attached to every point in space), but none of them has been experimental tested up to now.\n\nSo the answer to your question is simple: We don't know, but we're working on that.