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A supernova is a transient astronomical event that occurs during the last stellar evolutionary stages of a massive star's life, whose dramatic and catastrophic destruction is marked by one final titanic explosion.Supernova SN 185 is scientifically important because it's [supposed] remnants suggest a "titanic explosion" occurred in the "hollowed-out cavity" of an object in space.
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The earliest recorded supernova, SN 185, was viewed by Chinese astronomers in 185 AD.
https://en.wikipedia.org/wiki/Supernova
The gaseous shell RCW 86 is probably the supernova remnant of this event and has a relatively large angular size of roughly 45 arc minutes (larger than the apparent size of the full moon, which varies from 29 to 34 arc minutes).
The distance to RCW 86 is estimated to be 2,800 parsecs (9,100 light-years).
Recent X-ray studies show a good match for the expected age.
https://en.wikipedia.org/wiki/SN_185
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Seven deadly poisons - and a law that won't protect you