The Crab Nebula, whose light first reached Earth in 1054, is one of the remnants of supernovas that occurred in the past. The supernova seen in 1987 in the Large Magellanic Cloud, a tiny partner galaxy of the Milky Way (and given the 1987A designation), was the next best thing to Kepler’s supernova in recent years.

Other galaxies have also had a large number of supernova explosions, which are visible via telescopes but would have gone completely unnoticed by observers in Kepler’s time. To put it another way, it has been a while since we last witnessed a star explosion in our galaxy

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