Other
University of Leicester: Spiral Galaxies
Provides a general overview of spiral galaxies, including descriptions of the different classes of spiral galaxy.
Other
University of Leicester: Irregular Galaxies
Provides a general overview of irregular galaxies, including a specific look at type I and type II irregulars.
Space Telescope Science Institute
Galaxy Hunter: A Cosmic Photo Safari
Travel the universe and learn about galaxies. Investigate Hubble Deep Field observations to learn more.
NASA
Nasa Star Child: Galaxies
This resource has two levels: one for younger viewers and one for older viewers. It surveys the basic galaxy types and provides details.
NASA
Nasa Star Child: Galaxies (Level 1)
This site provides an introduction to galaxies for the younger student, that is divided into 2 levels of understanding. Find out what type of galaxy looks like a giant pinwheel. Audio content included. Good glossary, and a printable...
Other
University of Cambridge Cosmology: Galaxies
This site from the University of Cambridge allows you to view information on spiral, elliptical, and Milky Way galaxies, as well as galaxy clusters. Provides basic facts about each one.
Other
Sky Server: Galaxies
SkyServer explains and presents images of spiral galaxies, elliptical galaxies, irregular galaxies, galaxy clusters, galaxy collisions and the like.
Mocomi & Anibrain Digital Technologies
Mocomi: What Is a Galaxy?
Explains what galaxies are and their different shapes. Includes details on the Milky Way.