PX158 - K4 - the big bang theory

this is an expansion of the space-time itself, not an explosion

$H$, $He$ and some $Li$ were formed a the universe cooled

stars formed the other elements, up to $Fe$, via nuclear fusion

elements heavier than $Fe$ were produced via supernovae and kilonovae (NS-NS/NS-BH merges)

the big bang can explain the large scale structures in the universe, eg: galaxy voids, filaments, etc

need dark matter to do this

this dark matter has to be slow moving, cold dark matter (CDM)