University of California
Univ. Of Cal Berkeley: The Comet's Tale
Site provides extensive information in the study of comets. Includes excellent graphics that depict what comets look like as they travel through the solar system. Also includes information on how comets may have effected the Earth's...
NASA
Nasa: Space Place: Tails of Wonder!
Learn about comets as you try to bring some comet dust back to Earth in this game.
Space.com
Space.com: Comets Data Sheet
This resource explains what comets are, where they come from, and how comets can cause meteor showers.
California Institute of Technology
Spitzer Science Center: Riding a Trail of Debris
This image, titled "Riding a Trail of Debris" features the comet Encke with a clearly visible tail comprised of "gravel-like debris." The text under the image details various specifics about the picture.
Curated OER
Nasa: Space Place: Comet Hale Bopp
Comet Hale-Bopp's white dust tail and bright blue ion tail is visible from Earth.