White dwarfs: Facts about the dense stellar remnants

White dwarfs are what is left when stars like our sun have exhausted all of their fuel. They are dense, dim, stellar corpses — the last observable stage of evolution for low- and medium-mass stars.  

Whilst most massive stars will eventually go supernova, a low or medium mass star with a mass less than about 8 times the mass of the sun will eventually become a white dwarf, according to NASA. Approximately 97% of the stars in the Milky Way will eventually become white dwarfs, according to researchers.