The Crab Nebula (M1) is a supernova remnant lying 6,500 light-years away in Taurus. It is now thought that the supernova expansion was first seen on Earth in 1054 and noted by Chinese and Japanese astronomers as a "guest star" that was so bright as to be visible in daylight for almost a month and at night for about 2 years.
At the centre of the Nebula is the Crab Pulsar which is a rapidly rotating neutron star. The Crab Pulsar emits bursts of radiation every 33 milliseconds across the whole electromagnetic spectrum. It is one of the strongest sources of gamma radiation in the night sky.
Supernovas are created when a star explodes. Usually this happens either by a runaway nuclear fusion process or by collapse of a bigger star as its fuel source dies away. Recently a third type of supernova process is believed to occur when an intermediate sized dying star, running out of fuel, starts collapsing under gravity and electrons in its atoms are forced into the nuclei where they undergo a weak nuclear reaction with a proton releasing energy and leading to the supernova explosion. The Crab Nebula is believed to have been formed by the electron-capture type of supernova.
Processed in the dynamic narrowband combination for SHO suggested by Ludo here...
https://thecoldestnights.com/2020/06/pixinsight-dynamic-narrowband-combinations-with-pixelmath/
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