This greenish nebula was discovered by Charles Messier, a French astronomer of the 18th century. Originally he did not know what the object was, except that it was neither a star nor a comet. Now we know that it is a planetary nebula. It was formed by the explosion of a sun-like star (nova). It is officially designated as Messier 27 (M27, or NGC 6853), while it is commonly known as the Dumbbell Nebula. This beautiful nebula is located over 1,200 light-years away in the Vulpecula constellation. Image Credits: ESO, the European Southern Observatory.