Nearly 160,000 years ago, a star in the Large Magellanic Cloud (a galaxy close to our own Milky Way) erupted in a majestic, violent death. Traveling at the speed of light, the radiation from this explosion reached Earth on February 23, 1987. The brightest supernova seen in four centuries, it was one of the most significant discoveries of twentieth-century astronomy.
The saga of Supernova "1987A" began with a once-in-a-lifetime observation by a...