තවත් මාස කිහිපයකට පසු schwarzschild සහ hendrik lorentz ගේ ශිෂ් යයෙකු වූ johannes droste, තනි තනිවම ඒවාගේ ලක්ෂණ පිළිබඳව වැඩිදුර ලිව්වෝය. this solution had a peculiar behaviour at what is now called the schwarzschild radius, where it became singular, meaning that some of the terms in the einstein equations became infinite. the nature of this surface was not quite understood at the time. in 1924, arthur eddington showed that the singularity disappeared after a change of coordinates (see eddington coordinates), although it took until 1933 for georges lemaître to realize that this meant the singularity at the schwarzschild radius was an unphysical coordinate singularity.