M27: The Dumbbell Nebula . ... Explanation: The first hint of what will become of our Sun was discovered inadvertently in 1764. At that time, Charles Messier was compiling a list of "annoying" diffuse objects not to be confused with "interesting" comets. The 27th object on Messier's list , now known as M27 or the Dumbbell Nebula , is a planetary nebula , the type of nebula our Sun will produce when nuclear fusion stops in its core. ... NASA Web Site Statements, Warnings, and Disclaimers . ...