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	Comet Halley - Wikipedia, the free encyclopedia
		Comet Halley as taken with the Halley Multicolor Camera on the ESA Giotto mission.
		The 1986 approach was the least favourable for Earth observers of all recorded passages of the comet throughout history: the comet did not achieve the spectacular brightness of some previous approaches, and with increased light pollution from urbanization, many people never saw the comet at all.
		Further, the comet appeared brightest when it was almost invisible from the northern hemisphere in March and April, prompting many amateur astronomers to travel to the southern hemisphere for a glimpse of the interloper.
	en.wikipedia.org /wiki/Comet_Halley (1587 words)

	Halley's Comet
		Halley’s Comet was first depicted in the Nuremburg Chronicle of AD 684, when it was first sighted by the Chinese (and the Japanese, for the first time) on 6 September 684 in the western sky, but had disappeared by 9 October, having reached perihelion on 2 October.
		Halley was last at perihelion on 9 February 1986 at 0640 hr GMT, at 15° 35’ Aquarius, 75.81 years after the last, and was at close approach to Earth on 27 November 1985 and 11 April 1986.
		Halley’s Comet is thought to persuade people to remove the physical excuses and hypochondria they use to avoid undesirable things, and teaches an organic holism, creating renewed vitality.
	infoman16.tripod.com /Articles/halley.htm (2117 words)

	Comet Halley
		In 1705 Edmond Halley predicted, using Newton's newly formulated laws of motion, that the comet seen in 1531, 1607, and 1682 would return in 1758 (which was, alas, after his death).
		Halley's orbit is retrograde and inclined 18 degrees to the ecliptic.
		The nucleus of Comet Halley is approximately 16x8x8 kilometers.
	www.seds.org /nineplanets/nineplanets/halley.html (446 words)

	Comet Halley
		Comet Giacobini-Zinner was studied in 1985, Comet Halley in 1986, and CometGrigg-Skjellerup on July 10th, 1992.
		The nucleus of Halley is ellipsoidal in shape and measures approximately 16 by 8 by 8 kilometers (10 by 5 by 5 miles).
		At this period, the orientation of the comet is such that the tail is foreshortened, with the prolonged radius vector pointing west of north.
	www.solarviews.com /eng/halley.htm (670 words)

	Halley's Comet
		Halley's comet is a cylindrical shaped object measuring 16 by 8 by 8 kilometers and has an average period of seventy-six years.
		For comets, the layer is mostly composed of hydrogen and anti-hydrogen.
		As the comet approaches the sun, the density of matter increases, which causes a corresponding increase the matter and antimatter interactions with the nucleus, coma and tail of the comet.
	www.matter-antimatter.com /halleys_comet.htm (518 words)

	ESA Science & Technology: Halley
		Halley is important because it was the first periodic comet to be recognised.
		Halley's nucleus, which is about 16 x 8 x 8 km, has a low density, indicating that it is probably porous.
		Using Isaac Newton's newly published theory of gravitation, Halley calculated the orbits of several comets and made the revolutionary suggestion that the bright comet seen in 1682 was the same object previously recorded in 1531 and 1607.
	sci.esa.int /science-e/www/object/index.cfm?fobjectid=31876 (352 words)

	Halley - Wikipedia, the free encyclopedia
		Comet Halley, whose period was first calculated by Edmond Halley.
		Halley Armada, a group of space probes sent to examine Comet Halley in 1986.
		Halley Research Station, British research facility on the Weddell Sea in Antarctica.
	en.wikipedia.org /wiki/Halley (121 words)

	Highbeam Encyclopedia - Search Results for Halley's comet (Site not responding. Last check: 2007-10-30)
		Halley's comet HALLEY'S COMET [Halley's comet] or Comet Halley, periodic comet named for Edmond Halley, who observed it in 1682 and identified it as the one observed in 1531 and 1607.
		comet COMET [comet] [Grlonghaired], a small celestial body consisting mostly of dust and gases that moves in an elongated elliptical or nearly parabolic orbit around the sun.
		He is particularly noted as the first astronomer to predict the return of a comet and the first to point out the use of a transit of Venus in determining the parallax of the sun.
	www.encyclopedia.com /articles/05586.html (682 words)

	Halley's Comet (Site not responding. Last check: 2007-10-30)
		The comet named after British astronomer Edmund Halley is arguably the most famous of all comets, having been observed in 1531, 1607, 1682, 1758, 1834,1910 and 1986.
		Halley entered the picture in 1705, realizing that the appearance of 1682 was the same comet as those observed on the previous two dates listed above.
		Surmising that the comet was following the same laws which governed planetary orbits, he calculated the orbit corresponding to a 76 year period and predicted its return in 1758.
	hyperphysics.phy-astr.gsu.edu /hbase/solar/halley.html (313 words)

	Comet Halley
		In 1682, the comet was observed by Edmond Halley.
		By comparing the orbital elements derived from his own observations with that of the comet apparations of 1531 and 1607, he concluded that these three were the same object, and in 1705, he predicted its return in late 1758 or early 1759.
		The comet was eventually found by the German amateur astronomer Johann Georg Palitzsch on the night of December 26-27, 1758.
	www.seds.org /~spider/spider/Comets/halley.html (533 words)

	Comet Halley
		He found that the bright comets of 1531, 1607, and 1682 had almost the same orbits, and when he accounted for the gravitational perturbation on the cometary orbits from Jupiter and Saturn, he concluded that these were different appearances of the same comet.
		Tracing back in the historical records for recordings of bright comets and their positions in the sky, it was concluded that Halley had been observed periodically as far back as 240 B.C. The most recent return was in 1986, and the predicted next appearance of Halley in the inner Solar System will be in 2061.
		It is a view of the orbit of Halley and its 1996 position from the vantage of the ecliptic plane:
	csep10.phys.utk.edu /astr161/lect/comets/halley.html (450 words)

	NASA - Comet
		The nucleus of a comet is a ball of ice and rocky dust particles that resembles a dirty snowball.
		As a comet nears the inner solar system, heat from the sun vaporizes some of the ice on the surface of the nucleus, spewing gas and dust particles into space.
		Comets that pass near the sun come from two groups of comets near the outer edge of the solar system, according to astronomers.
	www.nasa.gov /worldbook/comet_worldbook.html (1245 words)

	Hawaiian History Moments
		Filled with excitement, residents rushed to the beaches and to high points in the Islands to view the glowing comet silhouetted against the night sky, its solid head surrounded by a nebulous luminescent cloud and trailing a curved vapor tail.
		Comet, from the Greek, simply means “long-haired star.” But the ancients believed a comet was the harbinger of good or evil.
		Halley’s Comet faithfully reappeared in 1910, and Hawai‘i was considered to be one of the best viewing spots on Earth.
	www.hawaiianhistory.org /moments/halley.html (202 words)

	Comets
		By far the most famous comet is Comet Halley but SL 9 was a "big hit" for a week in the summer of 1994.
		Comet Halley is the source of the Orionid shower in October.
		Was it a comet or an asteroid that caused the Chicxulub crater in the Yucatan (and probably caused the extinction of the dinosaurs)?
	www.nineplanets.org /comets.html (658 words)

	Coma for Halley's Comet :: Astrobiology Magazine ::
		The identity of the comet is beyond doubt: the image is faintly visible on composite photos obtained during a single night, demonstrating that the direction and rate of motion of the detected object perfectly matches that predicted for Comet Halley from its well-known orbit.
		After its passage in 1910, Comet Halley was again seen in 1982, when David Jewitt first observed its faint image with the 5-m Palomar telescope at a time when it was 11 AU from the Sun, a little further than planet Saturn.
		As the comet approached, the ice in the nucleus began to evaporate (sublimate), and the comet soon became surrounded by a cloud of dust and gas (the "coma").
	www.astrobio.net /news/article579.html (2006 words)

	Halley's comet
		Halley's comet is named after Edmond G. Halley who was the first to suggest that comets were natural phenomena of the solar system, in orbit around the Sun.
		He suggested that a certain comet was a regular visitor, returning every 76 years, and was, in fact, the same one which had been observed since 240 BC, but in particular in the years 1531, 1607, and 1682, dates which for him were recent history.
		Data taken by a suite of spacecraft suggests that the comet is mostly made of ice.
	www.windows.ucar.edu /tour/link=/comets/Halleys_comet.html (274 words)

	860322A Halley's Comet
		Englishman Edmond Halley predicted in 1705 that the comet that appeared over London in 1682 would reappear again in 1759, and that it was the same comet that appeared in 1607 and 1531.
		During the comet's 29th recorded apparition in 1910, much fear was generated when poisonous cyanogen gas was discovered in the spectrum of the comet's tail and it was predicted that the Earth would pass through it.
		During the latest visit of Halley's comet in 1985 and 1986, The Giotto space probe from Europe approached within 605 kilometers of the nucleus, and sent back amazing photos that showed an extremely dark, fl-color ed, peanut-shaped nucleus 16 kilometers long, with gigantic geysers of material being ejected from the nucleus.
	www.astropix.com /HTML/F_COMETS/860322A.HTM (493 words)

	ASP: The Return of Halley's Comet
		Comet Halley is a fine example of a short-period comet, taking about 76 years to make one orbit around the Sun.
		He drew the bold conclusion that all three were really the same comet, trapped by the gravitational pull of the outer planets, and predicted that the comet would retum in 1758-59.
		The best way for the average person to observe the comet will be to use a good pair of binoculars in a location that is away from city lights and has a good view of the horizon (since the comet will be low in the sky).
	www.astrosociety.org /education/publications/tnl/01/01.html (1816 words)

	Britain.tv Wikipedia - Comet Halley
		It is long since I saw you; but as I see you now you are much more terrible, for I see you brandishing the downfall of my country"?title=(William of Malmesbury, Deeds of the English Kings, Ch. 225, ISBN 0-19-820678-X).
		Mary Chapin Carpenter also had a song about the comet, "Halley Came To Jackson"?title=off her 1990 "Shooting Straight in the Dark"?title=album.
		In the Simpsons episode Bart the Mother, the family is waiting for eggs to hatch, when Homer says: "This is the most exciting thing I've seen since Halley's comet collided with the moon!"?title=(which of course never happened)
	www.britain.tv /wikipedia.php?title=Comet_Halley (1573 words)

	Halley's Comet (Site not responding. Last check: 2007-10-30)
		Halleys was first recognized between 1048 BC to 240 BC, unfortunitly we don't have pictures of that.
		Halley's Comet was named after Emund Halley, who predicted its orbit, unfortunitly he died before he could see his prediction come true.
		Halley's most famous apearence was at 1066 AD before the battle of Hastings.
	www.mste.uiuc.edu /scied/ci407/htmlproj/halley/halley.html (121 words)

	Exploring Comets - Comet Halley (Site not responding. Last check: 2007-10-30)
		On the night of October 16, 1982, the first image of the returning Comet Halley was recorded with the 200-inch Hale telescope at Mount Palomar.
		Systematic ground-based observations of Comet Halley were coordinated by the International Halley Watch.
		The nucleus of Comet Halley is 15 kilometers (9 miles) long by 8 kilometers (5 miles) wide.
	www.hrw.com /science/si-science/physical/astronomy/exploring/comets/comet_halley.html (358 words)

	Images Of Comet Halley (Site not responding. Last check: 2007-10-30)
		All were recorded before the closest approach of 596 km at 00:03:02 UTC on 14 March 1986; the last from a distance of 1180 km, 15 seconds before closest approach.
		Giotto false color image of the nucleus of comet Halley taken 95 seconds before closest approach from a distance of 6500 km.
		The nucleus of the comet is roughly 16 x 8 x 8 km.
	www2.jpl.nasa.gov /neo/images/halley.html (216 words)

	Halley's comet returns in bits and pieces
		October 20, 1998: The last time Halley's comet visited Earth, in 1986, many observers were disappointed because the famous comet was barely visible to the naked eye.
		Comet Halley isn't officially scheduled to visit Earth again until 2061 when it swings through the inner solar system on its 76-year orbit, but fans of Halley can see bits and pieces of the comet tonight during the annual Orionids meteor shower.
		Close-Up This image of Comet Halley's nucleus was taken by the Giotto spacecraft during a flyby on March 13, 1986.
	science.nasa.gov /newhome/headlines/ast20oct98_1.htm (854 words)

	Comet Halley (Site not responding. Last check: 2007-10-30)
		This image was taken on December 30, 1985 from a farm in Greene County PA (located south and west of the City of Pittsburgh) at around midnight local time, when the comet had an apparent magnitude of 5.4, approximately 42 days before perihelion.
		The approximate position of the comet is right ascension (RA) 22h 23m, declination -1deg 50m, in the constellation of Aquarius.
		The comet is positioned in the center of the image with its tail extending to the upper left hand corner of the screen.
	www.kollar.com /astronomy/comet-halley.html (233 words)

	C&MS: 1P/Halley
		His analysis of the list revealed the comets of 1531, 1607, and 1682 moved in almost identical orbits and were separated by intervals of roughly 75 years.
		The highlight of the 1986 apparition was the armada of space probes sent to visit the comet during February and March 1986.
		The comet is obviously in the lower left of the photo, with its tail extending towards one of the brightest regions in the Milky Way located in Sagittarius.
	cometography.com /pcomets/001p.html (1186 words)

	Comets
		Now we know that comets are lumps of ice and dust that periodically come into the center of the solar system from somewhere in its outer reaches, and that some comets make repeated trips.
		Comet Linear was discovered in 1999 and made its closest approach of the Sun in July 2000.
		The Stardust spacecraft flew by Comet Wild 2 in January 2004, collecting samples of the comet to return to Earth.
	www.windows.ucar.edu /tour/link=/comets/comets.html (338 words)

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