Since nobody was around to observe it, there is still debate surrounding the exact details of the origins of the cosmos, but it most certainly did not look like an explosion as presented in the above freeze-frame. There are some who say the origin of the universe came in a moment of extremely rapid matter expansion, aka the "Big Bang Theory." But the other, most common, camp is the "steady state" theory, wherein the universe has been expanding at the same rate since day one, and continues to expand at the same pace even now. Either way, though, both sides agree there was no "explosion." Instead the universe expanded like a balloon full of dark matter and other cool sci-fi sounding sciencey stuff.