The Three Kinds of Galaxies

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
Types and Classification of Galaxies Cornell Astronomy.
Galaxies  Astronomy For Kids  KidsAstronomycom
Galaxies Astronomy For Kids KidsAstronomycom.
Clusters of Galaxies  Astronomy Notes
Clusters of Galaxies Astronomy Notes.
Galaxies  Celestial Objects on Sea and Sky
Galaxies Celestial Objects on Sea and Sky.
National Geographic  Science and Space  Galaxies
National Geographic Science and Space Galaxies.
Astronomy for Kids Galaxies  Ducksters
Astronomy for Kids Galaxies Ducksters.
Galaxies Collisions  Spacecom
Galaxies Collisions Spacecom.

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