What has been disproved on dimacrituss theory of the cosmos?

One key aspect of Democritus' theory of the cosmos that has been disproved is his idea of atoms as indivisible and unchangeable particles. Modern physics has shown that atoms can be divided into subatomic particles and can also undergo changes through nuclear reactions and other processes. Additionally, Democritus' view of an infinite number of worlds with different properties has not been supported by observational evidence.