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physical object > natural object > celestial body > Messier object > Crab Nebula
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Crab Nebula comparison table
Subject has purpose has ejection velocity is part of is a kind of has catalog has wavelength has acronym produce is an instance of has synonym has image has definition has distance has age has composition has Messier number
Messier objectoriginally to catalog all objects which could be confused with a comet celestial spherecelestial bodyMessier catalog      an object assigned a number by Charles Messierfrom Earth   
supernova remnant 10000 km s-1gasradio sourceradio source catalogradioSNRsynchrotron radiation emission nebula A gaseous nebula, the expanding shell ejected by a supernova, and deriving its energy (at least in some cases) from the conversion by the remanent neutron star of its rotational energy into a stream of high-energy particles being continually accelerated in the SNR. About 100 SNRs are known in our Galaxy. Supernova remnants are usually powerful radio sources.  enhanced with heavy elements relative to the interstellar medium 
Crab Nebulaoriginally to catalog all objects which could be confused with a comet10000 km s-1gas Messier catalogradioSNRsynchrotron radiationMessier object2U 0531+22A chaotic, expanding mass of gas in Taurus, the remnant of a Type I supernova whose light reached Earth in 1054. It is an intense radio source, and its visible light is strongly polarized. It is also a source of X-rays and gamma-rays. Its total mass is about 1 Msun, but the total energy radiated by the Crab is 1037-1038 ergs s-1. It is periodically occulted by the Moon, and every June its radio spectrum is occulted by the solar corona.2 kpc947 yearsenhanced with heavy elements relative to the interstellar medium1

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