I heard for every (think it was) billion antimatter there was 1 extra matter. Does this mean before the annihilation after the big bang the universe was billions of times more heavy? So all that antimatter is now photons zipping around the universe? Other question. If there is all the matter & energy ever created, then why do particles pop in & out from the vacuum & annihilate each other? Looking for a simple answer if possible as wikipedia is over my head.