Supernova 1987a was a supernova in the Large Magellanic Cloud. It exploded on February 23 1987 (or rather, on that day the light from the supernova reached the earth). It was the first opportunity of modern astronomy to see a supernova this close; no supernova has taken place in our own galaxy since 1604. The supernova and its remains are among the most-studied astronomical objects.
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