The Curious Incident of the Supernova in the Nighttime

Detective Gregory: "Is there any other point to which you would wish to draw my attention?" Holmes: "To the curious incident of the dog in the night-time." Gregory: "The dog did nothing in the night-time." Holmes: "That was the curious incident." -- "Silver Blaze," by Arthur Conan Doyle Sometimes, you learn more about something when it isn't there. In January 2014, the light from a distant supernova reached Earth. It caused some excitement because the star that exploded was in the nearby galaxy ...