Have flat disks, spiral arms, a central bulge, and a surrounding halo. They're fairly large with lots of gas and younger stars in their arms, but older stars and little gas in their halos and central bulges

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1.
Have flat disks, spiral arms, a central bulge, and a surrounding halo. They're fairly large with lots of gas and younger stars in their arms, but older stars and little gas in their halos and central bulges