~150 solar masses is the Eddington limit[1] where the outward luminosity pressure becomes greater than the inward gravitational pressure holding the star togeth

~150 solar masses is the Eddington limit[1] where the outward luminosity pressure becomes greater than the inward gravitational pressure holding the star together. Stars probably cannot grow past this size through normal accretion. However, a few[2] stars have been estimated to have masses much greater than 150 solar masses, up to R136a1 [3] with an estimated 315 solar masses. [1] https://en.wikipedia.org/wiki/Eddington_luminosity https://en.wikipedia.org/wiki/Eddington_luminosity [2] https://en.wikipedia.org/wiki/List_of_most_massive_stars#List_of_the_most_massive_stars https://en.wikipedia.org/wiki/List_of_most_massive_stars#Lis... [3] https://en.wikipedia.org/wiki/R136a1 https://en.wikipedia.org/wiki/R136a1