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A supernova explosion that skywatchers in the Far East observed almost 850 years ago has produced the most unusual remnant astronomers have ever found. "I've worked on supernovae for [decades], and I've never seen anything like this," says Robert.

United statesBen casseseQuentin parkerDana patchickUniversity of hong kongRobert fesen dartmouth collegeMonthly notices of the royal astronomical societyBradley schaefer louisiana state universityWidefield infrared survey explorerJacco vink university of amsterdamAmerican astronomical societyAndreas ritter university of hong kongFar eastRobert fesenDartmouth collegeAstrophysical journal letters