Viewing a supernova a mere hours after its explosion so close to earth is extremely rare---a once-in-a-lifetime event. It is located in the Ursa Major constellation (Big Dipper) in the Pinwheel Galaxy. In twenty-four hours it was already twenty times brighter and should continue.
Scientists discover an 'instant cosmic classic' supernovaA supernova discovered August 24 is closer to Earth -- approximately 21 million light-years away -- than any other of its kind in a generation. Astronomers believe they caught the supernova within hours of its explosion, a rare feat made possible with a specialized survey telescope and state-of-the-art computational tools.