Supernova Remnant In M82 . ... Explanation: This false-color radio wavelength picture of an expanding stellar debris cloud is the product of one of the largest radio astronomy experiments ever. Combining the output of 20 radio telescopes scattered around planet Earth , astronomers have produced this amazingly detailed image of a supernova remnant just over 1.5 light-years across in M82 , an intense star forming galaxy 12 million light-years away. ... NASA Official: Jay Norris. ...