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Noun A galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms 'The new Whirlpool Galaxy image shows the spiral galaxy's classic features, from its curving arms, where newborn stars reside, to its yellowish central core that serves as home for older stars' More example sentences 'Four years ago astronomers reported that the spiral galaxy 22 million lightyears from Earth was inhaling two dwarf galaxies, M32 and NGC 5'Milky Way Galaxy, large spiral system consisting of several hundred billion stars, one of which is the Sun It takes its name from the Milky Way, the irregular luminous band of stars and gas clouds that stretches across the sky as seen from Earth Although Earth lies well within the Milky Way Galaxy (sometimes simply called the Galaxy), astronomers do not have as complete an understanding of its nature as they do of some external star systemsUntil recently, scientists thought J was an object within M31, a large spiral ga...