NASA's Stunning Astronomy Pictures: Pinwheel Galaxy and Dumbbell Nebula.

NASA's Astronomy Picture of the Day features stunning snapshots of celestial objects, including the Dumbbell Nebula, Messier 101, and the Milky Way Galaxy over the bioluminescent sea in the Maldives. A computer simulation tracks the formation of our universe, while a snapshot of Cassiopeia A shows a supernova remnant. Messier 101, also known as the Pinwheel Galaxy, is a massive pinwheel galaxy located about 25 million light-years away towards the Northern constellation of Ursa Major.