black dwarf

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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.

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black dwarf star dwarf star			When a white dwarf cools down, it becomes a black dwarf, a dense, cold object in the sky that astronomers have never seen. The most popular stars by Ornes, Stephen / Science News for Kids Red Ally and his friends around the Black Dwarf were for a time a colourful part of the Scottish left. If the recession hits, will Alistair be our Darling? by Daily Record (Glasgow, Scotland) Locals in the Nueva Roma neighbourhood in Casilda reported seeing a hairy black dwarf in the Candelaria canal. Strangeworld by The Journal (Newcastle, England)			black cherry tree black cock Black cockatoo black cod black coffee black cohosh Black comedy Black copper black cottonwood Black Country black cow black crappie black cuckoo black cumin black currant black cypress pine Black Death black diamond black diet black disc black disease black dog Black draught Black drop black duck black dwarf black dwarf star black earth black economy black elder black elderberry Black English Black English Vernacular black eye black fantail black felt cup Black Ferns black flag Black Flags Black flea Black flux black fly black forces Black Forest black fox Black Friar Black Friday black fritillary black frost black game black gold			Black Dollar Days Task Force Black Dot Black Dot Ringworm Black Dot Tinea Capitis Black Dragon Black Dragon Army Black Dragon Corps Black Dragon Fighting Society Black Dragon Kenpo Youth Organization Black Dragon River Black Dragon River Black Dragon Scale Mail Black Dragon Society Black Dragon Society Black draught Black draught Black draught Black Drongo Black Drongo Black drop Black drop Black drum black drums black drums black drums black drums black duck Black Duck Joint Venture black durain Black Dust black dwarf black dwarf star Black dwarfs Black dwarfs Black Dyke Band Black Dyke Mills Band Black Eagle Project Roodekrans Black ear fungus Black Earth Black Earth Black Earth Creek Watershed Association Black Earth Public Library black ebony black ebony Black Economic Empowerment Black Economic Empowerment Advisory Council Black Economic Empowerment Commission Black Economic Empowerment Group Black Economic Empowerment South Africa Black Economic Research Center Black Economies Black Economies Black Economies black economy black economy black economy Black Educators Student Association Black Efforts for Soul in Television Black El Paso Democrats black elder black elder

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