White Dwarf Trivia Questions

False. White dwarfs are hot but dim due to tiny surface area; they are not among the brightest stars.

False. White dwarfs have no fusion; they only cool and fade over billions of years.

The white dwarf ZTF J1901+1458, the smallest and most massive discovered, packs about 1.35 solar masses into a sphere just slightly larger than the Moon.

True. After helium burning ends, the core becomes carbon-oxygen, forming the white dwarf's composition.

True. In binary systems, hydrogen from a companion can ignite on the white dwarf's surface, causing a nova outburst.

True. White dwarfs are dead stars where gravity is balanced by Pauli exclusion principle of electrons, not heat from fusion.

False. Type II supernovae result from core collapse of massive stars, not white dwarfs. White dwarfs can cause Type Ia supernovae when they accrete mass beyond the Chandrasekhar limit.

A teaspoon of white dwarf material, with a density around 10⁶ g/cm³, would have a mass of roughly 5 tons—comparable to an average elephant.