> The only evidence for dark matter is that galaxies and galactic clusters are moving faster than they should be; i.e. they are acting like there is more gravit

> The only evidence for dark matter is that galaxies and galactic clusters are moving faster than they should be; i.e. they are acting like there is more gravitational mass around. There's more than that: https://en.wikipedia.org/wiki/Dark_matter#Observational_evidence https://en.wikipedia.org/wiki/Dark_matter#Observational_evid... Likewise for dark energy: https://en.wikipedia.org/wiki/Dark_energy#Evidence_of_existence https://en.wikipedia.org/wiki/Dark_energy#Evidence_of_existe...