Comet

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Montage of Tempel 1, about 6 km across, and Hartley 2; images by Deep Impact/EPOXI spacecraft

A comet is an icy small Solar System body (SSSB) that, when close enough to the Sun, displays a visible coma (a thin, fuzzy, temporary atmosphere) and sometimes also a tail. These phenomena are both due to the effects of solar radiation and the solar wind upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. Comets have been observed since ancient times and have traditionally been considered bad omens.

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• Related: Comet vintages, The Big Splash (book)

Comets Page Comets Page solarsystem.nasa.gov/planets/profile.cfm?Object=Comets - Web

International Comet Quarterly International Comet Quarterly www.icq.eps.harvard.edu - Web

How to Make a Model of a Comet How to Make a Model of a Comet www.magnet.fsu.edu/.../index.html - Web

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Catalogue of the Solar System Small Bodies Orbital... Catalogue of the Solar System Small Bodies Orbital Evolution smallbodies.ru/en/ - Web

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