Nobody did the volume in the space of our never ending universe was full and released or exploded and sent gases out and created stars. Here it is in steps.
step 1, The big bang
step 2, Gases after big bang formed stars
step 3, Those stars died and more and more and some formed then died once more.
step 4, After many stars died there were millions even trillions of black holes.
step 5, Those black holes merged then created galaxies.
step 6, Those super massive black holes brought more gas and stars until finally it filled up so much quasars exploded.
step 7, those quasars bursted and the black holes released gas and then they slowly died.
step 8, Each Matter, Atom, Energy, and gravitational Piece from the dying stars that were released by Hyper novas created life on many sustainable planet that the black hole created.
step 9, after the black holes created the galaxies everything seemed to calm down and life right where it is.
step 10, Billions of years into the future Black holes or The volume explode once more and the big bang happens again.
step 11, The cycle restarts
So thats how it happens everything is a cycle even the air you breath it cycles the universe does the same, but they are more then one universe but thats another story called dimensions.
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