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JanayPatriece
Exactly what it's named after: a spiral. Think of a spiral galaxy like a CD disk. The arms of it are filled with stars, dust, gases, etc. 
fitbit
The arms of a spiral galaxy have lots of gas and dust, and they are often areas where new stars are constantly forming. The bulge of a spiral galaxy is composed primarily of old, red stars. Very little star formation goes on in the bulge.