Crab Supernova explosion happened in 1054, and its evolution into the remnant it is now - called the Crab Nebula.

Crab Supernova explosion happened in 1054, and its evolution into the remnant it is now - called the Crab Nebula.
Modern understanding that the Crab Nebula was created by a supernova, an explosion of a massive supergiant star, dates to 1921 when Carl Otto Lampland announced he had seen changes in its structure.

This eventually led to the conclusion that the creation of the Crab Nebula corresponds to the bright SN 1054 supernova recorded by Chinese astronomers in AD 1054. There is also a 13th-century Japanese reference to an appearance of a new or “guest” star in Meigetsuki. It was then so bright it was visible during the daytime for 23 days.

Watch:
https://www.spacetelescope.org/videos/heic0515a/

Sources:
http://adsabs.harvard.edu/full/1952PASP...64..293D
https://heasarc.gsfc.nasa.gov/docs/heasarc/headates/1000.html
http://chandra.harvard.edu/photo/2002/0052/index.html

Animation credit:
ESA/Hubble (M. Kornmesser & L. L. Christensen)

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