FacebookTweetPinLinkedInEmail The Pinwheel galaxy is a forward facing spiral galaxy in the constellation of Ursa Major. The Pinwheel galaxy is also known as Messier 101 or NGC 54 57. The galaxy was discovered in 1781 and was then confirmed as a galaxy in the Messier catalogue, hence being named as an M galaxy with the M standing for Messier, after the famous astronomer … Continue reading Pinwheel Galaxy