the range of masses for white dwarf stars
Although white dwarfs are known with estimated masses as low as 0.17 M and as high as 1.33 M, the mass distribution is strongly peaked at 0.6 M, and the majority lie between 0.5 and 0.7 M. The estimated radii of observed white dwarfs are typically 0.8 -- 2% the radius of the Sun; this is comparable to the Earth's radius of approximately 0.9% solar radius. A white dwarf, then, packs mass comparable to the Sun's into a volume that is typically a million times smaller than the Sun's; the average density of matter in a white dwarf must therefore be, very roughly, 1,000,000 times greater than the average density of the Sun, or approximately 10 g / cm, or 1 tonne per cubic centimetre. A typical white dwarf has a density of between 10 and 10 g / cm. White dwarfs are composed of one of the densest forms of matter known, surpassed only by other compact stars such as neutron stars, black holes and, hypothetically, quark stars.