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Topic: Comet (disambiguation)

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	Comet - Wikipedia, the free encyclopedia
		Comets are thought of as debris left over from the condensation of a solar nebula; it is generally argued that the outer edges of such nebulae are cool enough that water exists in a solid (rather than gaseous) state.
		Short-period comets are thought to originate in the Kuiper belt, whereas the source of long-period comets is thought to be the Oort cloud.
		It soon became the accepted comet model and was confirmed when an armada of spacecraft (including the European Space Agency's Giotto probe and the Soviet Union's Vega 1 and Vega 2) flew through the coma of Halley's comet in 1986 to photograph the nucleus and observed the jets of evaporating material.
	www.encyclopedia-online.info /Comet (1617 words)

	Comet - Wikipedia, the free encyclopedia
		Comets are believed to originate in a cloud (the Oort cloud) at large distances from the sun consisting of debris left over from the condensation of the solar nebula; the outer edges of such nebulae are cool enough that water exists in a solid (rather than gaseous) state.
		Comets are now designated by the year of their discovery followed by a letter indicating the half-month of the discovery and a number indicating the order of discovery (a system similar to that already used for asteroids), so that the fourth comet discovered in the second half of February 2006 would be designated 2006 D4.
		He rejected the ideas of several earlier philosophers that comets were planets, or at least a phenomenon related to the planets, on the grounds that while the planets confined their motion to the circle of the Zodiac, comets could appear in any part of the sky.
	en.wikipedia.org /wiki/Comet (4380 words)

	Comet - the free encyclopedia (Site not responding. Last check: 2007-10-18)
		Comets are believed to originate in a cloud (the Oort cloud) at largedistances from the sun consisting of debris left over from the condensationof the solar nebula; the outer edges of such nebulae are cool enough that water exists in a solid (rather than gaseous) state.
		Comets are now designated by the year of their discovery followed by a letter indicating the half-month of thediscovery and a number indicating the order of discovery, so that the fourth comet discovered in the second half of February 2006would be designated 2006 D4.
		Herejected the ideas of several earlier philosophers that comets were planets, or atleast a phenomenon related to the planets, on the grounds that while the planets confined their motion to the circle of theZodiac, comets could appear in any part of the sky.
	www.encyclopedia-of-knowledge.com /?t=Comet (3403 words)

	Comet (Site not responding. Last check: 2007-10-18)
		Comets are thought of as debris left over from the condensation of a solar nebula ; it is generally argued that the outer edges of such nebulae are cool enough that water exists in a solid (rather than gas eous) state.
		He created a theory about the brightness of the comets coming from the evaporation from a solid object and that the non-gravitational forces of Comet Encke were caused by the jet force s created as the material evaporated from the surface of the object.
		It soon became the accepted comet model and was confirmed when an armada of spacecraft (including the European Space Agency 's Giotto probe and the Soviet Union 's Vega 1 and Vega 2) flew through the coma of Halley's comet in 1986 to photograph the nucleus and observed the jets of evaporating material.
	www.serebella.com /encyclopedia/article-Comet.html (1865 words)

	Read about Comet at WorldVillage Encyclopedia. Research Comet and learn about Comet here! (Site not responding. Last check: 2007-10-18)
		Until 1994, comets were first given a provisional designation consisting of the year of their discovery followed by a lowercase letter indicating its order of discovery in that year (for example, Comet Bennett 1969i was the 9th comet discovery in 1969).
		Comets are now designated by the year of their discovery followed by a letter indicating the half-month of the discovery and a number indicating the order of discovery, so that the fourth comet discovered in the second half of February 2006 would be designated 2006 D4.
		He rejected the ideas of several earlier philosophers that comets were planets, or at least a phenomenon related to the planets, on the grounds that while the planets confined their motion to the circle of the
	encyclopedia.worldvillage.com /s/b/Comet (3440 words)

	Comet - Open Encyclopedia (Site not responding. Last check: 2007-10-18)
		Some comets, such as the Sun-grazing comets, orbit in groups and are thought to be pieces of a single object that has broken apart.
		In the early 19th century, a German mathematician, Friedrich Wilhelm Bessel originated the theory that they were solid objects in a state of evaporation: from the study of their brightness, Bessel argued that the non-gravitational movements of Comet Encke were caused by jet forces created as material evaporated from the surface of the object.
		Comets are popular subjects for science fiction authors and filmmakers although they are often misrepresented as fiery objects, rather than icy.
	open-encyclopedia.com /Comet (1790 words)

	Comet Article, Comet Information (Site not responding. Last check: 2007-10-18)
		Often described as "dirty snowballs", comets arecomposed largely of frozen carbon dioxide, methane and water with dust andvarious mineral aggregates mixed in.
		Some comets have been observed tobreak up (Comet Biela was one example) while one has been observed to have collidedwith another object (Comet Shoemaker-Levy 9 which hitJupiter in 1994).
		Historically, comets were thought to be unlucky, or even interpreted as attacks by heavenly beings against terrestrialinhabitants.
	www.anoca.org /comets/orbits/comet.html (1554 words)

	Comet (Site not responding. Last check: 2007-10-18)
		Comets are thought of as debris left over from the condensation of a solar nebula ; it is generally argued that the outer edges of such nebulaeare cool enough that water exists ina solid (rather than gaseous) state.
		Soon this comet became known as Comet Halley, and from ancient sources it is known to have been observed by humanssince at least 66 BC.
		It soon became the accepted comet model and was confirmed when an armada of spacecraft (including the European Space Agency 's Giotto probe andthe Soviet Union 's Vega 1 and Vega 2) flew through the coma of Halley's comet in 1986 to photograph the nucleus and observed the jets of evaporating material.
	www.therfcc.org /comet-20011.html (1436 words)

	Encyclopedia: Orbit
		Any comet in a parabolic or hyperbolic orbit about the central star is not gravitationally bound to the star and therefore is not considered part of the star's planetary system.
		An open orbit has the shape of a hyperbola (or in the limiting case, a parabola); the bodies approach each other for a while, curve around each other around the time of their closest approach, and then separate again forever.
		This is often the case with comets that occasionally approach the Sun.
	www.nationmaster.com /encyclopedia/Orbit (5049 words)

	Comet - Unipedia (Site not responding. Last check: 2007-10-18)
		A comet is a small astronomical object similar to an asteroid but composed largely of ice.
		Comets typically move in highly elliptical orbits, the aphelia of which may be many times more distant than Pluto's orbit.
		Template:Hnote In 1836, the German mathematician Friedrich Wilhelm Bessel, after observing streams of vapor in the 1835 apparition of Comet Halley, proposed that the jet forces of evaporating material could be great enough to significantly alter a comet's orbit and argued that the non-gravitational movements of Comet Encke resulted from this mechanism.
	www.unipedia.info /Comet.html (3870 words)

	Comet
		For other uses of the word Comet, see Comet (disambiguation).
		nucleus sunlit from the left.]] A comet is a relatively small astronomical object similar to an asteroid but composed largely of ice.
		In these collisions, the ions will capture one or more electrons leading to emission of X-rays and far ultraviolet photons[1].
	encyclopedia.codeboy.net /wikipedia/c/co/comet.html (1583 words)

	ipedia.com: Moon Article (Site not responding. Last check: 2007-10-18)
		For researchers, KREEP is a convenient tracer, useful for reporting the story of the volcanic history of the lunar crust and chronicling the frequency of impacts by comets and other celestial bodies.
		The results of the Clementine mission suggested that small, frozen pockets of water ice (remnants of water-rich comet impacts) may be embedded unmelted in the permanently shadowed regions of the lunar crust.
		Although the pockets are thought to be small, the overall amount of water was suggested to be quite significant — 1 km³, or an amount the size of Lake Erie.
	www.ipedia.com /moon.html (3295 words)

	Comet (Site not responding. Last check: 2007-10-18)
		(As of May 2005, SOHO has discovered over 950 comets and is conducting a contest to guess the date of its 1000th comet discovery.
		"A Comet Model I. The Acceleration of Comet Encke".
		ESSAY ON COMETS (http://fax.libs.uga.edu/QB721xM635/), which gained the first of Dr. Fellowes's prizes, proposed to those who had attended the University of Edinburgh within the last twelve years.
	www.freecaviar.com /search.php?title=Comet (3734 words)

	flight - Hutchinson encyclopedia article about flight
		To attain supersonic speed, streamlining the aircraft body became insufficient: wings were swept back, engines buried in wings and tail units, and bodies were even eliminated in all-wing delta designs.
		In the 1950s the first jet airliners, such as the Comet (first introduced in 1949), were introduced into service.
		Today jet planes dominate both military and civilian aviation, although many light planes still use piston engines and propellers.
	encyclopedia.farlex.com /flight (1599 words)

	Comet : QuicklyFind Info (Site not responding. Last check: 2007-10-18)
		Current topic : Comet - View Index - Search for :
		Single-apparition comets have parabolic and hyperbolic orbits which will cause them to permenantly exit the solar system after one pass by the Sun.
		See list of comets for what is intended to be a more complete list.
	www.quicklyfind.com /info/Comet.htm (1562 words)

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