Here's why:
* Hot: White dwarfs are incredibly hot, with surface temperatures ranging from 8,000 to 40,000 Kelvin.
* Small Radius: They are also extremely dense, squeezing the mass of a star like our Sun into a sphere roughly the size of Earth.
White dwarfs are the remnants of stars like our Sun, after they have exhausted their nuclear fuel and shed their outer layers. They are essentially the collapsed cores of these stars, made up primarily of carbon and oxygen.
