Spiral galaxies have three main components: a bulge, disk, and halo (see right). The bulge is a spherical structure found in the center of the galaxy. This feature mostly contains older stars. The disk is made up of dust, gas, and younger stars. The disk forms arm structures. Our Sun is located in an arm of our galaxy, the Milky Way. The halo of a galaxy is a loose, spherical structure located around the bulge and some of the disk. The halo contains old clusters of stars, known as globular clusters.
Another cool page for galaxy classification:
Types and Classification of Galaxies Cornell Astronomy.
Galaxies Astronomy For Kids KidsAstronomycom.
Clusters of Galaxies Astronomy Notes.
Galaxies Celestial Objects on Sea and Sky.
National Geographic Science and Space Galaxies.
Astronomy for Kids Galaxies Ducksters.
Galaxies Collisions Spacecom.
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