It’s all gravity in the end. Or probably middle but I don’t know why gravity, so that’s as far as I can reduce it.

Everything we see around us is just hydrogen trying to get closer to the middle of the biggest hydrogen party it can find in the general vicinity. And we were all once part of at least one massive party that eventually got a bit out of hand when we all tried to get so close together we bounced off of a neutron star before it collapsed into a black hole.