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Unlike the other small bodies in the solar system, comets have been known since antiquity. There are Chinese records of Comet Halley going ... dust tail: up to 10 million km long composed of smoke-sized dust particles driven off the nucleus by escaping gases; this is the most prominent part of a comet to the unaided eye;
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nineplanets.org/comets.html
nineplanets.org/comets.html
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Comet - Wikipedia, the free encyclopedia
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A comet is a Small Solar System Body that orbits the Sun. When close enough to the Sun, a comet exhibits a visible coma (fuzzy "atmosphere"), and sometimes a tail, both because of the effects of sol...
en.wikipedia.org/wiki/Comet
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Comets are small asteroid-like bodies when they are far from the Sun, traveling in highly ellipical orbits about the Sun. When they sweep in close to the Sun, dramatic changes occur as they brighten and develop an extended tail. ... The nucleus is widely described as a "dirty snowball" composed of ice and some rocky debris.
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hyperphysics.phy-astr.gsu.edu/hbase/Solar/comet.html
hyperphysics.phy-astr.gsu.edu/hbase/Solar/comet.html
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Comets are small, fragile, irregularly shaped bodies composed of a mixture of non-volatile grains and frozen gases. They have highly elliptical orbits that bring them very close to the Sun and swing them deeply into space. ... For this reason, comets are said to be short-lived, on a cosmological time scale.
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www.solarviews.com/eng/comet.htm
www.solarviews.com/eng/comet.htm
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Comets are small celestial bodies (measuring from a few kilometers to tens of kilometers) that orbit the Sun. They are made up of ice , small rocks , dust . The ice is the main responsible for the tail displayed by comets when nearing the s...
http://wiki.answers.com/Q/What_are_comets
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Misconception: Asteroids, meteoroids, and comets are all the same type of object. ... Comets and Meteor Showers: Education Corner ... Misconception: Comets are composed entirely of gas.
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www.physics.umaine.edu/ncomins/links02.htm
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Two objects lurking around Jupiter and once thought to be rocky asteroids are actually comets composed mostly of ice and dirt. Scientists think the pair are Kuiper Belt objects that were captured by Jupiter’s gravity millions of years ago during the Solar System’s infancy. ... Asteroids Near Jupiter are Really Comets ;
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www.space.com/scienceastronomy/060201_jupiter_comet.htm...
www.space.com/scienceastronomy/060201_jupiter_comet.html
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University of Iowa astronomy professor Robert Mutel announced today that an eight-month search using an Arizona-based telescope has failed to detect evidence supporting a 13-year-old theory that small comets composed of snow are continually bombarding the Earth. ... Astronomers Discover Missing Link For Origin Of Comets (Sep.
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www.sciencedaily.com/releases/1999/12/991217083353.htm
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Comets are composed of rock and ice and have been called dirty snowballs. Comets can be found in a dense layer at the edge of the Solar System called the oort cloud. ... Astronomers believe that comets may be composed of the very material that formed the Solar System. Although most of the smaller objects in our solar...
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www.seasky.org/solarsystem/sky3l.html
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