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(Astronomy) one of a large class of small faint stars of enormous density (on average 108 kg/m3) with diameters only about 1 per cent that of the sun, and masses less than the Chandrasekhar limit (about 1.4 solar masses). It is thought to mark the final stage in the evolution of a sun-like star
a star that is approximately the size of the earth, has undergone gravitational collapse, and is in the final stage of evolution for low-mass stars, beginning hot and white and ending cold and dark (black dwarf).
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Adams Walter Sydney
black dwarf star
Scientists predict that white dwarfs should have oxygen-rich cores.
Theory suggests that large stars with seven to 10 times the mass of the Sun end their lives either as white dwarfs, or by exploding and collapsing into superdense neutron stars.
However, in rare instances, two of these objects orbit each other so closely-orbiting every few minutes-so that the helium from the lighter of the two gets pulled off by tidal forces and accumulates on the more massive white dwarf.
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