Find purchasing options and reviews pertaining to Carl Sagan's nonfiction book titled "Comets."
Author of a four-volume series on comets presents a useful guide to understanding and viewing comets and meteors. Includes an event calendar.
Learn more about the direct social and physical impact of comet debris and the possible long-term impact of rationalizing such phenomena.
Read this description of the components that make up a comet. Also features an amazing satellite photo of a comet entering Earth's atmosphere.
Weekly updated site posts the latest photos of comets orbiting within our solar system. Includes coordinates and conditions present when sighted.
Describes the astronomical phenomena of comets, held to be "dirty snowballs" that orbit the sun. With history, composition and classification.
Table of statistics and patterns displayed by such comets as Halley, Encke, and d'Arrest, presented by the National Space Science Data Center.
Celestial observers can browse through this amateur astronomer's logs and notes about his search for undiscovered comets.
Explains comets and their significant contributions to the history of space exploration. Includes photos and links to related data.
Utilize this monthly-updated guide to observable comets. Includes a list of best bets and a table with location data.
Review Skyhound's general introduction to comets. Learn where comets come from, why they have tails and what causes periodic comets.
Enjoy tips and an FAQ on locating telescopic comets. Includes a table on the practical comet magnitude limit for various size telescopes.
Guide to comets currently visible from the Southern Hemisphere. Includes news, location updates and links.
Find an introduction to the study of comets at submillimeter wavelengths. With news on the latest cometary sensations, Hale-Bopp and Hyakutake.
Aims to monitor the solar system for hazardous asteroids and comets which could impact Earth with devastating consequences.
Learn about the origin of comets, their characteristics and orbits, and the history of their study. With kids' activities.
Comet guide includes a gallery of images and animations. Learn about some famous comets and view a comet space exploration chronology.