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Informative illustrated explanation of what comets are, what they are made of, where they come from and how to observe them.
www.howstuffworks.com
The original discovery and latest news about a new class of interplanetary bodies.
smallcomets.physics.uiowa.edu
Comet's Long Tail Tickles Ulysses
The solar polar orbit satellite observed tail of comet Hyakutake by means of magnetic fields and particle count anomalies. Article from Science News.
sciencenews.org
Views of the Solar System: Comets
Basic features, data, discoveries, images and sections with specific information on selected comets.
www.solarviews.com
Windows to the Universe: Comets
General information and data, pictures, details on the most interesting ones.
www.windows.ucar.edu
Comet Information and the International Comet Quarterly
From the Smithsonian Astrophysical Observatory. News, observations, orbital data, comet names and designations, links.
cfa-www.harvard.edu
British Astronomical Association Comet Section
News, recent observations, observing information and advice.
www.ast.cam.ac.uk
Overview of comets, as described by a professional comet researcher.
www.ifa.hawaii.edu
A list of comets discovered by Canadian astronomers.
www3.ns.sympatico.ca
Orbit computations for selected comets.
www.oaa.gr.jp
Catalogue of Comet Discoveries
Downloadable catalog. Also news, reading list, articles, links.
www.comethunter.de
News, observations, analyses of current comets, images, archives, links.
www.fg-kometen.de
Images of sun grazing comets from the Solar and Heliospheric Observatory. Also, background, archives, and how to interpret images and report new discoveries.
ares.nrl.navy.mil
History, orbits, composition, ways comets are studied, relation to meteor showers. Comets Halley, Shoemaker-Levy 9. From the National Air and Space Museum.
www.nasm.si.edu
Encyclopedia entry covers physical characteristics, history. List of well-known comets.
en.wikipedia.org