Taken by Walter Gebhart. Messier 101 (M101), also known as the Pinwheel Galaxy, is a large face-on spiral galaxy located about 21 million light-years away in the constellation Ursa Major. Discovered by Pierre Méchain in 1781, it spans roughly 170,000 light-years, making it significantly larger than our Milky Way. Taken with wide angle (F2@715mm FL) suitable for nebulae, to telephoto (3910mm focal length at F11) now suitable for deep space objects with only 2 hours (120-60 second frames) worth of exposures.
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