black dwarf
noun Astronomy.
See under white dwarf.
Words nearby black dwarf
black diet,
black disc,
black disease,
black dog,
black duck,
black dwarf,
black earth,
black economy,
black english,
black english vernacular,
black eye
Definition for black dwarf (2 of 2)
white dwarf
noun Astronomy.
a star, approximately the size of the earth, that 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).
Compare
Chandrasekhar limit.
Origin of white dwarf
First recorded in 1920–25
British Dictionary definitions for black dwarf
white dwarf
noun
one of a large class of small faint stars of enormous density (on average 10 8 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
Scientific definitions for black dwarf (1 of 2)
black dwarf
The theoretical celestial object that remains after a white dwarf has used up all of its fuel and cooled off completely to a solid mass of extremely dense, cold carbon. A white dwarf will eventually become a black dwarf unless it has a companion star from which it can take sufficient mass to pass the Chandrasekhar limit and collapse into a neutron star or black hole. No black dwarf has ever been observed. Because the estimated cooling time for a white dwarf is in the trillions of years, it is unlikely that there are many, if any, black dwarfs in our universe, which is only 12 to 18 billion years old. See Note at dwarf star.
Scientific definitions for black dwarf (2 of 2)
white dwarf
A small, extremely dense star characterized by high temperature and luminosity. A white dwarf is believed to be in its final stage of evolution, having either used up most of its nuclear fuel in its main-sequence stage, or else moved through a giant stage and shed any remaining fuel in its outer layer as a planetary nebula, leaving only a glowing core. Some 10 percent of all stars in the Milky Way are white dwarfs, but despite their intrinsic luminosity, they are so small that none are visible to the naked eye. See Note at dwarf.
Cultural definitions for black dwarf
white dwarf
A kind of star about the size of the Earth. White dwarfs represent a final stage of the life cycle of stars similar to the sun; they are formed when the stars use up their fuel and can no longer support nuclear reactions.