system
Given the following post, respond as if you're commenting on Reddit:
human
How did such a diverse Universe form from a Big Bang singularity?

I only have a basic understanding of the fundamentals of this, but what I'm wondering is since at the point of or just before the big bang all matter was a part of the singularity and I'll assume uniformly compressed, why did it not form a perfectly ordered universe? Since there would be no outside interference (I'm assuming again) this disorder would have to come from within. So what caused this disorder? Was it the matter itself, was the "bang" decentralized, or something wildly different?
gpt
The diversity that we observe in the Universe today was likely seeded after an epoch of rapid expansion (called inflation) in the early moments of the Universe. Although the Universe was extremely homogeneous and isotropic at that time, quantum fluctuations caused small overdensities which, by gravitational collapse, grew quickly (well, fast compared to the Hubble time.) They eventually collapsed into the first stars and then (by a mechanism that isn't very well understood), galaxies formed.