The Pinwheel Galaxy (also often known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy distanced 21 thousand light-years (six megaparsecs) away within the constellation Ursa Significant, first discovered by means of Pierre Méchain in March 27, 1781, and communicated in order to Charles Messier that verified its location for inclusion within the Messier Catalogue united of its last entries.
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