Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Cygnus_X-1> ?p ?o }
- Cygnus_X-1 abstract "Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.".
- Cygnus_X-1 thumbnail Cygnus_IAU.svg?width=300.
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- Cygnus_X-1 wikiPageExternalLink 1995ApJ...455..623C.
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- Cygnus_X-1 wikiPageWikiLink A_Brief_History_of_Time.
- Cygnus_X-1 wikiPageWikiLink Accretion_disk.
- Cygnus_X-1 wikiPageWikiLink Active_galactic_nucleus.
- Cygnus_X-1 wikiPageWikiLink Aerobee.
- Cygnus_X-1 wikiPageWikiLink Alnilam.
- Cygnus_X-1 wikiPageWikiLink Angular_momentum.
- Cygnus_X-1 wikiPageWikiLink Apparent_magnitude.
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- Cygnus_X-1 wikiPageWikiLink Black_hole.
- Cygnus_X-1 wikiPageWikiLink Blue_supergiant.
- Cygnus_X-1 wikiPageWikiLink CENBOL.
- Cygnus_X-1 wikiPageWikiLink Carbon.
- Cygnus_X-1 wikiPageWikiLink Carina–Sagittarius_Arm.
- Cygnus_X-1 wikiPageWikiLink Category:Binary_stars.
- Cygnus_X-1 wikiPageWikiLink Category:Cygnus_(constellation).
- Cygnus_X-1 wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
- Cygnus_X-1 wikiPageWikiLink Category:O-type_supergiants.
- Cygnus_X-1 wikiPageWikiLink Category:Objects_named_with_variable_star_designations.
- Cygnus_X-1 wikiPageWikiLink Category:Stellar_black_holes.
- Cygnus_X-1 wikiPageWikiLink Category:X-ray_binaries.
- Cygnus_X-1 wikiPageWikiLink Celestial_coordinate_system.
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- Cygnus_X-1 wikiPageWikiLink Conjunction_(astronomy).
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- Cygnus_X-1 wikiPageWikiLink Electromagnetic_spectrum.
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- Cygnus_X-1 wikiPageWikiLink Erg.
- Cygnus_X-1 wikiPageWikiLink Eta_Cygni.
- Cygnus_X-1 wikiPageWikiLink Event_horizon.
- Cygnus_X-1 wikiPageWikiLink Extinction_(astronomy).
- Cygnus_X-1 wikiPageWikiLink Flux.
- Cygnus_X-1 wikiPageWikiLink Galactic_coordinate_system.
- Cygnus_X-1 wikiPageWikiLink Gamma_ray.
- Cygnus_X-1 wikiPageWikiLink Geiger_counter.
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- Cygnus_X-1 wikiPageWikiLink Interstellar_medium.
- Cygnus_X-1 wikiPageWikiLink Jansky.
- Cygnus_X-1 wikiPageWikiLink Kip_Thorne.
- Cygnus_X-1 wikiPageWikiLink Leiden_Observatory.
- Cygnus_X-1 wikiPageWikiLink Light.
- Cygnus_X-1 wikiPageWikiLink Limb_darkening.
- Cygnus_X-1 wikiPageWikiLink Line-of-sight_propagation.
- Cygnus_X-1 wikiPageWikiLink Magnetic_field.
- Cygnus_X-1 wikiPageWikiLink Matter.
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- Cygnus_X-1 wikiPageWikiLink National_Radio_Astronomy_Observatory.
- Cygnus_X-1 wikiPageWikiLink Nebula.
- Cygnus_X-1 wikiPageWikiLink Neutron_star.