Subrahmanyan Chandrasekhar was born #OTD in 1910. He established an upper limit on the mass of stable white dwarf stars, and made numerous contributions to astrophysics and relativity.

Above the Chandrasekhar Limit – about 1.44 solar masses – electron degeneracy pressure cannot prevent a stellar remnant’s gravitational collapse into a neutron star or black hole.

Photo: Stephen Lewellyn / AIP