Astronomers Uncover ‘Extreme’ Ultra-Dense, Moon-Sized White Dwarf Nearing Collapse Subscribe Sputnik International https://sputniknews.com/science/202107031083296393-astronomers-uncover-extreme-ultra-dense-moon-sized-white-dwarf-nearing-collapse/ White dwarfs are ancient stars that develop after having exhausted their nuclear fuel and expelling the majority of its outer materials. Typically, said stars carry about half the mass of the Sun and maintain a size just slightly larger than the Earth. However, that’s not the case for all, it seems. Astronomers surveying the cosmos have uncovered quite the unusual and highly unexpected find: a white dwarf star similar in size to the Earth’s moon that has a mass far greater than the Sun.