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Crab Nebula
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Crab Nebula
The Columbia Encyclopedia, Sixth Edition
Crab Nebula diffuse gaseous nebula in the constellation Taurus; cataloged as NGC 1952 and M1, the first object recorded in Charles Messier's catalog of nonstellar objects. It is the remnant of a supernova that was observed in 1054 by Chinese and Arab astronomers to be as bright as Venus; markings in northern New Mexico depict a star near a crescent moon that might be a record of this supernova. Only three other supernovas have been observed in our galaxy since then. The explosion of the Crab Nebula produced a large expanding shell of delicate filaments. The filaments contain ionized gas in which unusually energetic electrons twist through magnetic fields at speeds close to that of light, emitting synchrotron radiation. Although this radiation is what makes supernova remnants visible in radio wavelengths, in this nebula it is so strong that observers can see the filaments through moderate-sized optical telescopes under good conditions. The nebula is also a strong emitter of X rays. At its center is a pulsar , PSR 0531+21, that spins 30 times per second. The youngest pulsar observed, it gives off radiation at radio, optical, ultraviolet, X-ray, and gammay ray wavelengths, as well as electrons that power the synchrotron radiation in the surrounding nebula.
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The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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Crab Nebula
Crab Nebula A supernova remnant approximately...radio source Taurus A. The Crab Nebula is the remains of a star that...xD7; 7.5 l.y. Optically, the nebula has two components: an outer...high-speed electrons from the Crab Pulsar . It is highly polarized...
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Crab Nebula
Crab Nebula Nebula located c. 6500 light years away in the constellation of Taurus. It is...1054, when it shone as brightly as Venus, visible even in daylight. The nebula was discovered in 1731 by the English astronomer John Bevis, and independently...
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Crab Nebula
...from which electromagnetic radiation has been detected over the entire measurable spectrum . In the late 1960s a pulsar, thought to be the collapsed remnant star of the supernova, was found near its centre. Crab Nebula Crab Nebula Crab Nebula
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nebula
...various tenuous clouds of gas and dust in interstellar space. Nebulae constitute only a small percentage of a galaxy 's mass. Dark nebulae (e.g., the Coalsack ) are very dense, cold molecular clouds...large, obscure, irregularly shaped areas in the sky. Bright nebulae (e.g., the Crab Nebula ...
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emission nebula
emission nebula A luminous cloud of gas and dust in space which shines with...ultraviolet radiation; examples are H II regions and planetary nebulae, which are ionized by central stars. Gas may also glow because...Finally, some of the light from supernova remnants such as the Crab Nebula is produced ...
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