black dwarf

1. 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.
2. See Note at dwarf star

Example Sentences

"It's a dead white dwarf—a 'black dwarf', you might say," Morey replied.

From Project Gutenberg

The "Black Dwarf" was not written till a good many years after Ritchie's death.

From Project Gutenberg

But apparently not in any earlier than The Black Dwarf, which was written in 1816, the year in which the poem was published.

From Project Gutenberg

His watchfulness availed him nothing, however, for no further sign of the Black Dwarf.

From Project Gutenberg

This is "the black dwarf," or Sir Edward Mauley, the hero of the novel.

From Project Gutenberg