Before the discovery of pulsars, Iosif Schlovskii determined that the whitish glow around this entity is composed of synchrotron radiation produced by an accreting neutron star.
Before the discovery of pulsars, Iosif Schlovskii determined that the whitish glow around this entity is composed of synchrotron radiation produced by an accreting neutron star. The observation of knotty filaments within it indicates that it has been rapidly expanding over the last nine centuries, since it was first observed by the (*) Chinese in the same year as the Battle of Hastings. A 1066 AD supernova produced this object, placed first in Charles Messier's namesake catalogue. For 10 points, identify this astronomical object, named after a certain arthropod.
Before the discovery of pulsars, Iosif Schlovskii determined that the whitish glow around this entity is composed of synchrotron radiation produced by an accreting neutron star.
{Crab Nebula} (accept {M1} before Messier; accept {NGC 1952} or {Taurus A})