White Dwarfs White Dwarfs are remains of a dead star basically. White Dwarfs are Steller core remnants composed mostly of electron-degenerate matter. Their mass is comparable to Sun but their size and volume are comparable to Earth. They are faint and their faint luminosity comes from the emission of stored thermal energy inside them as they were one core of a star, after all. White dwarfs are the final evolutionary state of those stars which don't have enough mass to become a neutron star at the end of their lives. Those stars having mass not more than 10 solar masses become a white dwarf. As they are faint compared to other star types they are very hard to detect even with powerful telescopes. One way to find them is to look for stars with unexplained back and forth motion which suggests that the star has a massive companion and if you see a faint, dim object near the star, it's more likely a white dwarf. The brightest star in our night sky Sirius or called Sirius A has a...