O.K I try, but first I need to put some information on the table: 1) Space is something: Based on the "The Fabric of the Cosmos" by physicist Brian Greene, Space has properties that can not be ignored.... It can stretch, twist, warp, and ripple under the influence of gravity. Albert Einstein general relativity His equations of general relativity predict a number of phenomena, many of which have been confirmed: -bending of light around massive objects (gravitational lensing) -a slow evolution in the orbit of the planet Mercury (perihelion precession) -frame dragging of space-time around rotating bodies -weakening of light escaping gravity's pull (gravitational redshift) - speeding up in the rotational periods of binary stars and pulsars -gravitational waves (ripples in space-time fabric) caused by cosmic smashups -the existence of black holes that trap everything including light 2)The existence of Voids & Super-voids: -Cosmic voids, and supervoids, are large volumes of space that are devoid of matter. This link has some of the latest information on cosmic voids. 3) Stephen Hawking: Story of Everything So to answer to Your question: Space didn't exist before the Big Bang, It was created with the big bang. What existed before the big bang? It's still an open question. What if before the Big Bang there was nothing, just a empty infinite void. And then the Big Bang happen, The expansion of the universe began. If this empty infinite void before the Big Bang exist, then it could be that is acting like a vacuum, pulling the Universe ( and SPACE ) in every direction..... since there is no resistance, there is no deceleration........ Since all the matter / energy / space was created in the big bang event, and the Universe still expanding, then eventually voids or super-voids will begin to fill the gaps caused by this vacuum effect pulling the universe apart.