Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Black_dwarf> ?p ?o }
- Black_dwarf abstract "A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light. Because the time required for a white dwarf to reach this state is calculated to be longer than the current age of the universe (13.8 billion years), no black dwarfs are expected to exist in the universe yet, and the temperature of the coolest white dwarfs is one observational limit on the age of the universe. A white dwarf is what remains of a main-sequence star of low or medium mass (below approximately 9 to 10 solar masses (M☉)) after it has either expelled or fused all the elements for which it has sufficient temperature to fuse. What is left is then a dense sphere of electron-degenerate matter that cools slowly by thermal radiation, eventually becoming a black dwarf. If black dwarfs were to exist, they would be extremely difficult to detect, because, by definition, they would emit very little radiation. They would, however, be detectable through their gravitational influence.Various white dwarfs cooled below 3900 K (M0 spectral class) have been found recently by astronomers using MDM Observatory's 2.4-meter telescope. They are estimated to be 11 to 12 billion years old.Because the far-future evolution of stars depends on physical questions which are poorly understood, such as the nature of dark matter and the possibility and rate of proton decay, it is not known precisely how long it will take white dwarfs to cool to blackness., § IIIE, IVA. Barrow and Tipler estimate that it would take 1015 years for a white dwarf to cool to 5 K; however, if weakly interacting massive particles exist, it is possible that interactions with these particles will keep some white dwarfs much warmer than this for approximately 1025 years., § IIIE. If protons are not stable, white dwarfs will also be kept warm by energy released from proton decay. For a hypothetical proton lifetime of 1037 years, Adams and Laughlin calculate that proton decay will raise the effective surface temperature of an old one-solar-mass white dwarf to approximately 0.06 K. Although cold, this is thought to be hotter than the cosmic background radiation temperature 1037 years in the future., §IVB.The name black dwarf has also been applied to substellar objects that do not have sufficient mass, less than approximately 0.08 M☉, to maintain hydrogen-burning nuclear fusion. These objects are now generally called brown dwarfs, a term coined in the 1970s. Black dwarfs should not be confused with black holes or neutron stars.".
- Black_dwarf wikiPageID "83124".
- Black_dwarf wikiPageLength "7401".
- Black_dwarf wikiPageOutDegree "36".
- Black_dwarf wikiPageRevisionID "702956073".
- Black_dwarf wikiPageWikiLink Age_of_the_universe.
- Black_dwarf wikiPageWikiLink Black_hole.
- Black_dwarf wikiPageWikiLink Brown_dwarf.
- Black_dwarf wikiPageWikiLink Category:Hypothetical_stars.
- Black_dwarf wikiPageWikiLink Category:Star_types.
- Black_dwarf wikiPageWikiLink Category:Stellar_evolution.
- Black_dwarf wikiPageWikiLink Category:White_dwarfs.
- Black_dwarf wikiPageWikiLink Chemical_element.
- Black_dwarf wikiPageWikiLink Compact_star.
- Black_dwarf wikiPageWikiLink Cosmic_background_radiation.
- Black_dwarf wikiPageWikiLink Dark_matter.
- Black_dwarf wikiPageWikiLink Degenerate_matter.
- Black_dwarf wikiPageWikiLink Effective_temperature.
- Black_dwarf wikiPageWikiLink Gravity.
- Black_dwarf wikiPageWikiLink Heat.
- Black_dwarf wikiPageWikiLink Heat_death_of_the_universe.
- Black_dwarf wikiPageWikiLink Hydrogen.
- Black_dwarf wikiPageWikiLink Light.
- Black_dwarf wikiPageWikiLink MDM_Observatory.
- Black_dwarf wikiPageWikiLink Main_sequence.
- Black_dwarf wikiPageWikiLink Naked_eye.
- Black_dwarf wikiPageWikiLink Neutron_star.
- Black_dwarf wikiPageWikiLink Nuclear_fusion.
- Black_dwarf wikiPageWikiLink Planetary_nebula.
- Black_dwarf wikiPageWikiLink Proton_decay.
- Black_dwarf wikiPageWikiLink Solar_mass.
- Black_dwarf wikiPageWikiLink Stellar_classification.
- Black_dwarf wikiPageWikiLink Substellar_object.
- Black_dwarf wikiPageWikiLink Sun.
- Black_dwarf wikiPageWikiLink Thermal_radiation.
- Black_dwarf wikiPageWikiLink Weakly_interacting_massive_particles.
- Black_dwarf wikiPageWikiLink White_dwarf.
- Black_dwarf wikiPageWikiLinkText "Black dwarf".
- Black_dwarf wikiPageWikiLinkText "becomes a Black dwarf.".
- Black_dwarf wikiPageWikiLinkText "black dwarf".
- Black_dwarf wikiPageWikiLinkText "black".
- Black_dwarf wikiPageUsesTemplate Template:Citation_needed.
- Black_dwarf wikiPageUsesTemplate Template:Other_uses.
- Black_dwarf wikiPageUsesTemplate Template:Reflist.
- Black_dwarf wikiPageUsesTemplate Template:Solar_mass.
- Black_dwarf wikiPageUsesTemplate Template:Star.
- Black_dwarf wikiPageUsesTemplate Template:Star_nav.
- Black_dwarf wikiPageUsesTemplate Template:White_dwarf.
- Black_dwarf wikiPageUsesTemplate Template:Wiktionary.
- Black_dwarf subject Category:Hypothetical_stars.
- Black_dwarf subject Category:Star_types.
- Black_dwarf subject Category:Stellar_evolution.
- Black_dwarf subject Category:White_dwarfs.
- Black_dwarf hypernym Remnant.
- Black_dwarf type Place.
- Black_dwarf type Astrophysic.
- Black_dwarf type Object.
- Black_dwarf type Redirect.
- Black_dwarf comment "A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light. Because the time required for a white dwarf to reach this state is calculated to be longer than the current age of the universe (13.8 billion years), no black dwarfs are expected to exist in the universe yet, and the temperature of the coolest white dwarfs is one observational limit on the age of the universe.".
- Black_dwarf label "Black dwarf".
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- Black_dwarf sameAs Sort_dværg_(astronomi).
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- Black_dwarf sameAs Musta_kääpiö.
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- Black_dwarf sameAs 黒色矮星.
- Black_dwarf sameAs 흑색왜성.
- Black_dwarf sameAs Schwaarzen_Zwerg.
- Black_dwarf sameAs Juodoji_nykštukė.
- Black_dwarf sameAs Црно_џуџе.
- Black_dwarf sameAs ကြယ်ပုနက်.
- Black_dwarf sameAs Zwarte_dwerg.
- Black_dwarf sameAs Svart_dverg.
- Black_dwarf sameAs Sort_dverg.
- Black_dwarf sameAs Czarny_karzeł.
- Black_dwarf sameAs Anã_negra.
- Black_dwarf sameAs m.0l9c2.
- Black_dwarf sameAs Pitică_neagră.
- Black_dwarf sameAs Чёрный_карлик.
- Black_dwarf sameAs Black_dwarf.
- Black_dwarf sameAs Čierny_trpaslík.
- Black_dwarf sameAs Črna_pritlikavka.
- Black_dwarf sameAs Црни_патуљак.