© Robert GendlerThe arrow points to a supernova discovered in a nearby pair of colliding galaxies called the Antennae. The supernova was discovered in the Catalina Real-Time Transient Survey that uses data collected by UA Lunar and Planetary Laboratory observers using telescopes in the Santa Catalina Mountains north of Tucson.
Astronomers have been mining a mother lode of astronomical data from The University of Arizona's Catalina Sky Survey and finding more "optical transients" than they can characterize during the past 17 months.
They have found more than 700 unique "optical transients," or objects that change brightness on time scales of minutes to years. They've also found 177 supernovae. That's more than dedicated supernova surveys have turned up during that time.
Their discoveries include the most energetic supernova ever seen, and a nearby stellar explosion in the Antennae galaxy that is helping astronomers refine the cosmic distance scale. Unlike most dedicated supernova surveys, Catalina Sky Survey telescopes cover the entire sky each month, allowing the team to record supernovae in dim galaxies where others weren't looking.