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Hoag's galaxy is about 120,000 light years across, making it slightly larger than the Milky Way. Both galaxies have two populations of stars: Old stars In Hoag's galaxy, the yellow nucleus is made up old stars. The Milky Way's the nuclear bulge contains mainly old stars. Young stars In Hoag's Galaxy, new stars are forming in the outer blue ring. The Milky Way's spiral arms are made up of newly formed stars.