I thought you might be interested in this.
the team found that one nitrate spike is close to the year 1054, when Chinese observers saw a bright supernova. That explosion left behind the Crab Nebula and pulsar. Another spike is close to 1006, the year of an even brighter supernova. Unseen supernova? The third nitrate spike is around the year 1060, when no supernova was reported.Wow, thanks rdl6989, definitely interested!
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