M27: The Dumbbell Nebula

Explanation: What will become of our Sun? The first hint of our Sun 's future was discovered inadvertently in 1764 . At that time, Charles Messier was compiling a list of diffuse objects not to be confused with comets. The 27th object on Messier's list , now known as M27 or the Dumbbell Nebula, is a planetary nebula , one of the brightest planetary nebulae on the sky -- and visible toward the constellation of the Fox ( Vulpecula ) with binoculars. It takes light about 1000 years to reach us from M27, featured here in colors emitted by hydrogen and oxygen . We now know that in about 6 billion years, our Sun will shed its outer gases into a planetary nebula like M27, while its remaining center will become an X-ray hot white dwarf star. Understanding the physics and significance of M27 was well beyond 18th century science, though. Even today, many things remain mysterious about planetary nebulas , including how their intricate shapes are created.