The Chandrasekhar limit is now accepted to be approximately 1.4 times the mass of sun; any white dwarf (a small very dense star that is typically the size of a planet) with less than this mass will stay a white dwarf forever, while a star that exceeds this mass is destined to end its life in that most violent explosions: A Supernova.
After which Nobel Laureate in Physics was this limit named - Subrahmanyan Chandrasekhar