SN 1572
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SN 1572, or B Cassiopeiae, was a supernova of Type Ia in the constellation Cassiopeia, one of eight supernovae visible to the naked eye in historical records. It appeared in early November 1572 and was independently discovered by many individuals.
Remnant of SN 1572 as seen in X-ray light from the Chandra X-ray Observatory
The red circle visible in the upper left part of this WISE infrared image is the remnant of SN 1572.
Cassiopeia (constellation)
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Cassiopeia is a constellation and asterism in the northern sky named after the vain queen Cassiopeia, mother of Andromeda, in Greek mythology, who boasted about her unrivaled beauty. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today. It is easily recognizable due to its distinctive 'W' shape, formed by five bright stars.
Cassiopeia in the night sky
Kappa Cassiopeiae and its bow shock. Spitzer infrared image (NASA/JPL-Caltech)
Planetary nebula IC 289 is a cloud of ionised gas being pushed out into space by the remnants of the star's core