But it wasn’t really an explosion, it was more like a spontaneous, insane inflation that found itself suddenly huge and empty, only after it was through with that particular stage did it zap itself full of energy and matter everywhere all at once. Then it continued growing in volume and thinning out via regular ol’ relativistic expansion.

EDIT: looking a little bit closer, there’s the thing about zapping all over itself after Inflation, it was almost perfectly half-and-half matter/antimatter, which then proceeded to join and annihilate into pure energy, but for some reason probably related to the Weak Force, just a little bit more matter was created than antimatter.

And that’s what we are and see today, 1 part out of every 8 million-and-one. For every 4,000,000 parts antimatter, there were 4,000,001 parts matter, only that 1 left over particle of matter, multiplied a bazillion times.

That’s just a whole other level of amazing than just saying “an explosion”.