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Topic: Coalsack Nebula

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	ninemsn Encarta - Search Results - Nebula
		Nebula, a localized mass of the gases and finely divided dust particles that are spread throughout interstellar space.
		Crab Nebula, gas cloud that is the remnant of a supernova, or exploding star, in the constellation Taurus.
		Dumbbell Nebula, planetary nebula in the northern constellation Vulpecula, at right ascension 19h 59.6m, declination 22° 43′; it is also known as M27...
	au.encarta.msn.com /Nebula.html (76 words)

	dark nebula (Site not responding. Last check: 2007-09-19)
		Dark nebulae can be seen if they obscure part of a emission or reflection nebula (eg.
		The largest dark nebulae are visible to the naked eye, appearing as dark patches against the brighter background of the Milky Way.
		They contain much of the mass of the interstellar medium, are some 150 light-years across, and have an average density of 100 to 300 molecules per cubic centimetre and an internal temperature of only 7 to 15 K.
	www.yourencyclopedia.net /Dark_nebula.html (429 words)

	[No title] (Site not responding. Last check: 2007-09-19)
		This is probably the closest nebula to earth as it is only 300 light years away, this is a planetary nebula that has been expelled from a star and is said to resemble an exotic flower, it is actually closer to that of a ring which circles the star in which it was expelled.
		This nebula is found in the southern hemisphere in the constellation known as carina or the keel, the nebula is visible to the naked eye as well as through a telescope and binoculars.
		The nebula is part of the nebula called the cygnus loop which is the remains of supernova that took place nearly 50,000 years ago.
	www.btinternet.com /~Clanger_moon/bodwad/Nebulas.htm (863 words)

	Coalsack Nebula (Site not responding. Last check: 2007-09-19)
		The Coalsack Nebula is the most prominent dark nebula in the skies, well visible to the naked eye as big dark patch silouhetted against the southern Milky Way.
		The Coalsack is located approximately 600 light years away, in the constellation Crux, covering nearly 7° by 5° and overlaps somewhat into the neighbour constellations Centaurus and Musca.
		Mattila[?] proved the Coalsack isn't totally fl; it has a very dim glow, 10% of the brightness of the surrounding Milky Way, which comes from the reflection of the stars is obscurs, the contrast makes the nebula appear darker than every other part of the sky.
	www.factbase.info /co/coalsack-nebula.html (168 words)

	nebula
		Nebulae are the birthplaces of stars, but some nebulae are produced by gas thrown off from dying stars (see planetary nebula; supernova).
		An emission nebula, such as the Orion nebula, glows brightly because its gas is energized by stars that have formed within it.
		In a reflection nebula, starlight reflects off grains of dust in the nebula, such as surround the stars of the Pleiades cluster.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0002430.html (251 words)

	Dark nebula - Wikipedia, the free encyclopedia
		A dark nebula is a large cloud which appears as star-poor regions where the dust of interstellar medium seems to be concentrated.
		Dark nebulae can be seen if they obscure part of an emission or reflection nebula (eg.
		In the inner regions of dark nebulae important events take place, such as the formation of stars.
	en.wikipedia.org /wiki/Dark_nebula (415 words)

	Coalsack Nebula -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-09-19)
		Although this nebula was known to the people of the Southern Hemisphere in prehistoric times, its first observation was reported by (Click link for more info and facts about Vincente Yanez Pinzon) Vincente Yanez Pinzon in 1499.
		In 1970, K. Mattila proved the Coalsack is not totally fl; it has a very dim glow (10% of the brightness of the surrounding Milky Way) which comes from the reflection of the stars it obscures.
		The Coalsack is not present in the (Click link for more info and facts about New General Catalogue) New General Catalogue and does not have an identification number.
	www.absoluteastronomy.com /encyclopedia/c/co/coalsack_nebula.htm (189 words)

	Phil Thorne/Demo/Welcome to My Galaxy (Site not responding. Last check: 2007-09-19)
		The Trifid Nebula in Sagittarius is a large, three-lobed emission nebula with a pronounced greenish tinge.
		Omega was lost in the supernova, presumed killed, but reappeared several million years later as the absolute master of the antimatter universe beyond the fl hole, driven mad by the isolation and his desire to exact revenge against the people he perceived as having abandoned him.
		The Coalsack is a dark nebula of carbon-rich, light-absorbing dust.
	www.underbase.org /user/thorne/web/galaxy/galaxy.htm (558 words)

	The Coalsack Dark Nebula
		The Coalsack is the most prominent and conspicuous dark nebula in the skies, well visible to the naked eye as big dark patch in the Milky Way, This object is easily seen in the southern part of the Southern Cross and covers and obscures about 26 square degrees of the sky.
		The Coalsack dark nebula was pre-historically known to the people of the Southern Hemisphere.
		The Coalsack Nebula from the International Space Station, by Donald R. Pettit (Feb 2003)
	www.seds.org /messier/xtra/ngc/coalsack.html (288 words)

	Star Formation
		Nebulae are simply clouds of interstellar gas and dust and appear either as dark regions blotting out background stars - the so-called dark or absorption nebulae or as brighter clouds of gas that emit or reflect light.
		Gas is these nebulae is hot enough to be ionised and the emitted light is due to interactions between the free electrons and the ions and to electron transitions within ions.
		Actually there are three main types of emission nebulae; HII regions associated with starbirth regions such as M42, the Great Nebula in Orion, planetary nebulae associated with the death of lower-mass stars and supernova remnants (SNRs).
	outreach.atnf.csiro.au /education/senior/astrophysics/stellarevolution_formation.html (2553 words)

	Deepsky Streicher 2004 March (Site not responding. Last check: 2007-09-19)
		I have studied this nebula over a period of more than 6 years, and I could detect that Eta Carina is brighter now compared to six months ago.
		Innes described the nebula 70 years ago as a red-orange oval shape or the shape of a little fat man with stubby arms and legs.
		The little nebula is called the Homunculus or manikin, and is expanding at the high speed of 500km/s.
	www.saao.ac.za /assa/html/deepsky_streicher_2004_march.html (1622 words)

	Nebula - Wikipedia, the free encyclopedia
		The MyCn18 is a young planetary nebula located about 8,000 light years away.
		A nebula (Latin for "mist"; pl. nebulae) is an interstellar cloud of dust, gas and plasma.
		They can be detected when they obscure stars or other nebulae.
	en.wikipedia.org /wiki/Nebula (336 words)

	All words on Nebula
		This nebula is a region in which stars are forming.]] A nebula (Latin for "mist"; plur.
		* Emission nebulae are internally illuminated clouds of ionized gas.
		* Reflection nebulae are illuminated by reflections from nearby stars.
	www.allwords.org /ne/nebula.html (541 words)

	iqexpand.com (Site not responding. Last check: 2007-09-19)
		SFWA Nebula Awards -- 2005 Nebula Weekend 2005 Nebula Awards Â® Weekend The Winners: Novel: Paladin of Souls, by Lois McMaster Bujold (Eos, Oct 2003) Novella: andquot; The Green Leopard Plague,andquot; by Walter Jon...
		Nebula award lists SFWA and Nebula Awards are registered trademarks of the Science Fiction and Fantasy Writers of America, Inc. SFWA Nebula Awards Site Map Recent Additions: 2004 Nebula Winners The Nebula...
		Nebula M 1 RA 5:35; Dec 22:01 (Taurus) Type: supernova remnant Distance: 6000 ly In 1758, Charles Messier found this nebula while hunting for comets.
	nebula.iqexpand.com (590 words)

	Nebula Concert Tickets, Biography, Music and Posters (Site not responding. Last check: 2007-09-19)
		Two of the most common types of emission nebula are H II regions and Planetary nebulae Reflection nebulae** are illuminated by reflections from nearby stars.
		Famous examples include the Horsehead nebula in Orion, and the Coalsack Nebula in the Southern Cross.HII regions are the birthplace of stars.
		The newly-formed stars ionize the surrounding gas to produce an emission nebula.Other nebulae are formed by the death of stars.
	www.chartbreaker.net /Nebula.htm (605 words)

	NEBULA FACTS AND INFORMATION (Site not responding. Last check: 2007-09-19)
		Emission_nebulae are internally illuminated clouds of ionized gas.
		Reflection_nebulae are illuminated by reflections from nearby stars.
		A star that undergoes the transition to a white_dwarf blows off its outer layer to form a planetary_nebula.
	www.witwib.com /?s=nebula (234 words)

	Interstellar Medium: Cold
		Some dark nebula are surrounded by emission regions, giving the impression that the dark cores are being dissolved by the hotter gas as in the Eagle Nebula shown below.
		This nebula indicates that the interaction between dark nebula and bright, hot gas is dynamic and ongoing.
		Often in the centers of dark nebula are dense concentrations of gas and dust called molecular clouds.
	zebu.uoregon.edu /~js/ast122/lectures/lec22.html (1441 words)

	Nebula - Unipedia (Site not responding. Last check: 2007-09-19)
		A nebula (Latin for "mist"; pl. nebulae) is an interstellar cloud of dust and gas.
		The Crab Nebula and Related Supernova Remnants (Proceedings of a Workshop Held at George Mason University, Fairfax, Virginia, October 11-12 1984)
		Nebula Award Stories Volume 2 (Nebula Award Stories)
	www.unipedia.info /Nebula.html (377 words)

	The Coalsack Loop
		This object is most likely the expanding remains of an old supernova remnant or HII region, and its location suggests that it may be interacting with the Coalsack.
		The Coalsack is composed of two clouds located at distances of 188 pc and 243 pc (Seidensticker and Schmidt-Kaler 1989).
		The Coalsack Loop has been identified as G303.5+0 in the radio continuum survey of Duncan et al.
	www.atnf.csiro.au /pasa/15_1/walker/paper/node4.html (394 words)

	CANOPUS 02/02 - A to Zee of Astronomee (Site not responding. Last check: 2007-09-19)
		Coalsack nebula (Southern Coalsack) – a prominent Dark Nebula about 170 Parsecs distant in the southern constellation of Crux.
		Thought to be composed mainly of carbon and silicate material with, in some cases, mantles of water, amonia or carbon dioxide ice.
		Crab Nebula (M1; NGC 1952) – a turbulant expanding mass of gas and cosmic dust with luminous twisting filaments of ionized gas lying about 2000 parsecs away in the constellation of Taurus.
	www.aqua.co.za /assa_jhb/Canopus/Can2002/c022Azee.htm (834 words)

	Wikipedia: Crux
		Alternatively, if a line is constructed perpendicularly between α Centauri (Toliman) and β Centauri, the point where the above line and this line intersect marks the Southern Celestial Pole.
		The Coalsack Nebula is the most prominent dark nebula in the skies, well visible to the naked eye as big dark patch in the southern Milky Way.
		Another deep sky object within Crux is the open cluster NGC 4755.
	www.factbook.org /wikipedia/en/c/cr/crux.html (365 words)

	Search Results for Cygnus - Encyclopædia Britannica
		group of bright nebulae (Lacework Nebula, Veil Nebula, and the nebulae NGC 6960, 6979, 6992, and 6995) in the constellation Cygnus, thought to be remnants of a supernova—i.e., of the explosion of a...
		The best-observed old supernova remnant is the Cygnus Loop (or the Veil Nebula), a beautiful, filamentary object roughly in the form of a...
		The nebula is a cloud of interstellar gas ionized from within by young, hot stars.
	www.britannica.com /search?query=Cygnus&submit=Find&source=MWTEXT (449 words)

	PSR Discoveries: Hot Idea: Comet Hale-Bopp
		The Coalsack nebula, of Barnard 86, is what one of these dark molecular clouds might look like as the star formation process is just beginning.
		New models of the collapse of the Solar Nebula are suggesting that because of these larger disks, comets may form much farther out in the nebula.
		As they settle through the nebula to the mid-plane, frictional heating may vaporize the icy coating, which can later recondense on the cold grain cores at the midplane.
	www.psrd.hawaii.edu /Feb97/Science.html (1509 words)

	Solar HTML - Cosmic Database (Site not responding. Last check: 2007-09-19)
		A cloud of gas and dust in space, nebulae are the birthplaces of stars.
		Some nebulae are produced by gas thrown off from dying stars.
		After a star such as the Sun has expanded to become a red giant, its outer layers are ejected into space to form a planetary nebula, leaving the core as a white dwarf at the centre.
	mysite.wanadoo-members.co.uk /blobrana/database/nebula.html (224 words)

	Nebula articles and news from Start Learning Now (Site not responding. Last check: 2007-09-19)
		Originally nebula was a general name for any extended astronomyastronomical astronomical objectobject, including galaxygalaxies beyond the Milky Way (some examples of the older usage survive; for example, the Andromeda Galaxy is sometimes referred to as the Andromeda Nebula).
		Famous examples include the Horsehead nebula in Orion (constellation)Orion, and the Coalsack Nebula in the CruxSouthern Cross.
		The newly-formed stars ionizationionize the surrounding gas to produce an emission nebula.
	www.startlearningnow.com /Nebula.htm (298 words)

	Vogelstrausskluft \| Coalsack and Jewel Box
		Dark Nebulae are, like all other nebulae, accumulations of gas and dust, that are not, and this is the difference, lightened by stars in their neighbourhood or their interior.
		The less stars can be seen inside the dark region therefore, the closer the nebula is to our earth.
		The distance to the »Coalsack« is estimated to about 400-500 light-years, and its size to a total of 60-70 light-years in diameter.
	www.vogelstrausskluft.com /sterne/sterne_kohlensack_e.php (211 words)

	Search Results for starry - Encyclopædia Britannica
		a dark nebula in the Crux constellation (Southern Cross).
		Easily visible against a starry background, it is perhaps the most conspicuous dark nebula.
		Consequently, the simplest descriptions of the star patterns and of the motions of heavenly bodies...
	www.britannica.com /search?query=starry&submit=Find&source=MWTAB (349 words)

	Nebula - Definition of Nebula by Webster Dictionary
		The term was originally applied to any diffuse luminous region.
		Now, technically, it is applied to interstellar clouds of dust and gases (diffuse nebula).
		Black Magellanic Cloud, Crab Nebula, Gegenschein, bright diffuse nebula, coalsack, counterglow, dark cloud, dark nebula, diffuse nebula, dust cloud, gaseous nebula, nebula of Lyra, nebular hypothesis, nebulosity, nebulous stars, planetary nebula, ring nebula, the Coalsack, zodiacal light
	www.webster-dictionary.net /definition/Nebula (149 words)

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