At the macro level, Space could expand outward infinitely, or maybe if you travel further enough and you return to where you started. Or maybe there's the multi

At the macro level, Space could expand outward infinitely, or maybe if you travel further enough and you return to where you started. Or maybe there's the multiverse thats teaming with infinite universes? Most physicists will tell you that at the quantum level, the most fundamental level is at the Planck scale, and the "nothingness" of space is still teaming with particles popping in and out of existence. Some particles being hypothetical and have yet to be discovered.