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Message * Articles On Spiral Galaxies, including Andromeda Galaxy, Messier 100, Triangulum Galaxy, Ngc 7742, Spiral Galaxy, Pinwheel Galaxy, Messier 83, Messier 61, Ngc 4631, Black Eye Galaxy, Tullyâ€"fisher Relation, Ngc 300, Dwingeloo 1 - 1243263733 - 9781243263735