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Topic: Dark nebula

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	Dark nebula - Wikipedia, the free encyclopedia
		A dark nebula is a large molecular cloud which appears as a star-poor region 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.
		The largest dark nebulae are visible to the naked eye, appearing as dark patches against the brighter background of the Milky Way.
	en.wikipedia.org /wiki/Dark_nebula (430 words)

	Sea and Sky's Cosmic Wonders: Nebulae
		Indeed, a nebula is a cosmic cloud of gas and dust floating in space.
		Dark nebulae are usually seen together with emission and reflection nebulae.
		It is a dark region of dust in the shape of a horse's head that blocks the light from a much larger emission nebula behind it.
	www.seasky.org /cosmic/sky7a05.html (1150 words)

	nebula. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Diffuse nebulae appear as light or dark clouds (called bright and dark nebulae), are irregular in shape, and range up to 100 light-years in diameter.
		Some bright nebulae, composed primarily of hydrogen gas ionized by nearby hot blue-white stars, radiate their own light; they are called emission nebulae and are characterized by narrow spectral emission lines.
		Dark nebulae are detected as empty patches in a field of stars or as dark clouds obscuring part of a bright nebula in the background, as in the case of the Horsehead Nebula.
	www.bartleby.com /65/ne/nebula.html (415 words)

	Coalsack Nebula - Wikipedia, the free encyclopedia
		The Coalsack Dark Nebula (or simply the Coalsack) is the most prominent dark nebula in the skies, easily visible to the naked eye as a dark patch silhouetted against the southern Milky Way.
		It was known pre-historically on the Southern Hemisphere and was observed by Vincente Yanez Pinzon in 1499.
		Although this nebula was known to the people of the Southern Hemisphere in prehistoric times, its first observation was reported by Vincente Yanez Pinzon in 1499.
	en.wikipedia.org /wiki/Coalsack_Nebula (227 words)

	Dark Nebula
		The dark nebulae are clumps or clouds that become opaque because of their internal dust grains.
		Some of the brightest infrared sources are associated with such dark dust clouds; a good example is the class of T Tauri variables, named for their prototype star in the constellation Taurus.
		The variables are always found in or near dark nebulae; they often are also powerful sources of infrared radiation, corresponding to warm clouds of dust heated by the T Tauri star to a few hundred kelvins.
	abyss.uoregon.edu /~js/glossary/dark_nebula.html (1102 words)

	Dark nebulae (Site not responding. Last check: 2007-09-05)
		A dark nebula is a massive agglomeration of densely populated interstellar dust.
		Many dark nebulae exhibit somewhat recognizable shapes, and are named for their perceived appearance, such as the "Pipe Nebula", which looks somewhat like a smoker's pipe, complete with stem and bowl.
		Dark nebulae are difficult to resolve from less than dark locations.
	www.belmontnc.4dw.net /dkneb.htm (915 words)

	FAAC - Ford Amateur Astronomy Club
		Nebulae can be divided into three general classifications: bright nebulae, dark nebulae, and planetary nebulae.
		Dark nebulae, the second major class, are composed of the same type of dust as reflection nebulae, but have no nearby stars to illuminate them.
		Dark nebulae are not very popular as amateur observing targets because they are usually difficult to see.
	www.boonhill.net /faac/other/basic/basic10.html (841 words)

	Nebulae - Crystalinks
		These nebulae are usually red because the predominant emission line of hydrogen happens to be red (other colors are produced by other atoms, but hydrogen is by far the most abundant).
		Reflection nebulae and emission nebulae are often seen together and are sometimes b oth referred to as diffuse nebulae.
		Dark nebulae are also often seen in conjunction with reflection and emission nebulae.
	www.crystalinks.com /nebula.html (921 words)

	Horsehead Nebula Region
		The nebula strip running south from Alnitak is the designated IC 434, into which the famous dark nebula called the Horsehead Nebula (Barnard 33) protrudes from the eastern side.
		Dark nebulae are clouds of dust in space that obscure stars and other objects behind them.
		The Horsehead Nebula in Orion is a well-known photo target, pictures of it are found in many astronomy textbooks and surely every astrophotographer is proud to present his own version of the famous dark nebula.
	astro.nightsky.at /Photo/Neb/B33_WN.html (1049 words)

	More M24: Barnard 93 Dark Nebula (Site not responding. Last check: 2007-09-05)
		It is one of the first dark nebulae known, discovered in 1913 by E.E. Barnard (Barnard 1913).
		Martin Germano obtained this beautiful photograph of the dark nebula Barnard 93 in the northern portion of star cloud M24.
		This nice Dark Lane (4 Co G) is on the edge of a Galactic Star Cloud in Sagittarius, M 24.
	www.obspm.fr /messier/more/m024_b93.html (196 words)

	eSky: Horsehead Nebula
		A famous dark nebula in the constellation of Orion.
		The famous dark Horsehead Nebula lies in the central regions of Orion.
		The dark shape of a horse's head is silhouetted against the red-pink nebula IC 434, near Alnitak in Orion's Belt (shown to the left of the nebula in this view).
	www.glyphweb.com /esky/nebulae/horsehead.html (175 words)

	Types of Nebulae
		Reflection nebulae are clouds of dust which are simply reflecting the light of a nearby star or stars.
		Reflection nebulae and emission nebulae are often seen together and are sometimes both referred to as diffuse nebulae.
		Dark nebulae are clouds of dust which are simply blocking the light from whatever is behind.
	astro.nineplanets.org /twn/types.html (667 words)

	THE PIPE DARK NEBULA
		It is part of an even larger complex of dark nebulae of which the Pipe appears as the hind quarters of a galactic "dark horse", visible here if you tilt your head to the left, squint your eyes, and use your imagination.
		A small "S" shaped dark nebula called the Snake Nebula is visible midway between the horse's legs.
		On the right side of the frame is a large complex of red emission nebulae and blue reflection nebulae near Antares and Rho Ophiuchus.
	www.astropix.com /HTML/D_SUM_S/PIPE.HTM (244 words)

	APOD: June 21, 1997 - The Pipe Dark Nebula (Site not responding. Last check: 2007-09-05)
		Explanation: The dark nebula predominant at the lower left of the above photograph is known as the Pipe Nebula.
		The dark clouds, suggestively shaped like smoke rising from a pipe, are caused by absorption of background starlight by dust.
		Many types of nebula are highlighted here: the red are emission nebula, the blue are reflection nebula, and the dark are absorption nebula.
	antwrp.gsfc.nasa.gov /apod/ap970621.html (112 words)

	NebulaeDrawings (Site not responding. Last check: 2007-09-05)
		Other nebulae are virtual stellar nurseries — massive and complex gatherings of dust and gas, in which stars are being born under gradual but tumultuous circumstances.
		It is surrounded by a cloak of obscuring darkness.
		The Cocoon is situated in a very provocative location: inside the end of a long dark nebula, Barnard 168, which interestingly is visible in binoculars as a narrow blank band of darkness against a rich starfield background.
	www.belmontnc.4dw.net /nebulae.htm (2949 words)

	ipedia.com: Dark nebula Article (Site not responding. Last check: 2007-09-05)
		In astronomy, the dust of interstellar medium seems to be concentrated in large clouds which appears as star -poor regions called dark nebulae.
		Dark nebulae can be seen if they obscure part of a emiss...
		In astronomy, the dust of interstellar medium seems to be concentrated in large clouds which appears as star-poor regions called dark nebulae.
	www.ipedia.com /dark_nebula.html (437 words)

	Nebulae and Star Formation (Site not responding. Last check: 2007-09-05)
		This eerie, dark structure, resembling an imaginary sea serpent's head, is a column of cool molecular hydrogen gas and dust that is an incubator for new stars.
		The nebula, called IC 349, is so bright because it lies extremely close to the bright Pleiades star Merope--only about 3,500 times the separation of the Earth from the Sun, or about 0.06 light-year--and thus is strongly illuminated by the star's light.
		This stunning picture of the center of the Omega Nebula, a hotbed of newly born stars wrapped in colorful blankets of glowing gas and cradled in an enormous cold, dark hydrogen cloud, was taken on April 1 and 2, 2002 by the newly installed Advanced Camera for Surveys (ACS) aboard NASA's Hubble Space Telescope.
	faculty.rmwc.edu /tmichalik/NebandStar.htm (6462 words)

	Horsehead Nebula (Site not responding. Last check: 2007-09-05)
		The dark nebula that forms the Horsehead itself is known as Barnard 33 (B 33).
		The red background is the emission nebula IC 434, the reflection nebula NGC 2023 and the emission nebula are NGC 2024 also visible.
		The dark lanes in NGC 2024 may be part of the same dark nebula that forms the Horsehead.
	astroa.physics.metu.edu.tr /twn/b33x.html (102 words)

	[No title]
		Dark nebula B86 is distinct on the west side and the dark nebula and the cluster are about the same size.
		There are several dark markings with 5 arcmins of the center of the cluster and three small groupings of 10 pretty faint stars that are clusters within a cluster.
		This dark region is surrounded by several little star groupings of 8 to 10 stars embedded in the Star Cloud.
	www.saguaroastro.org /content/db/textversions/Sagittarius.TXT (4114 words)

	NGC 2164, Reflection Nebula; McNeil's Nebula
		The squiggly object near the bottom of the Kopernik image is a reflection nebula in the constellation of Orion.
		This nebula has apparently varied in brightness over the years and was not visible for most of the last century before late 2003.
		The nebula and red "star" at its south end seem to be related to IR source IRAS 05436-0007, and possibly Herbig-Haro Objects 22 and 23.
	www.kopernik.org /images/archive/n2064.htm (497 words)

	The Horsehead Nebula Barnard 33
		The first published description of the Horsehead Nebula was given in Barnard (1913), and it was first cataloged by Barnard (1919).
		The remarkable Horsehead is a dark globule of dust and non-luminous gas, obscuring the light coming from behind, especially the moderately bright nebula IC 434.
		It is the most remarkable feature of an interesting region of diffuse nebulae, which belongs to a huge cloud of gas and dust situated 1,600 light years away in the direction of constellation Orion.
	www.obspm.fr /messier/xtra/ngc/b33.html (300 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/ast222/lectures/lec17.html (1630 words)

	dark nebula concept from the Astronomy knowledge base (Site not responding. Last check: 2007-09-05)
		Bok globule (4 facts) - A compact, spherical dark nebula that absorbs radiation.
		Coalsack (5 facts) - A prominent dark nebula readily visible to the naked eye, located on the galactic plane.
		Horsehead Nebula (4 facts) (NGC 2024) - An absorption nebula in the middle of Orion.
	www.csi.uottawa.ca:4321 /astronomy/darknebula.html (154 words)

	Inpsyde Media - Dark Nebula - The Dark Files (IME007) Music.Trance.Goa - CD
		Following the sucess of Dark Nebula's last two albums on both Nephilim Records and Digital Psionics.
		Dark Nebula - The Dark Files The Dark Files has brought together brand new dance floor gems with classic Dark Nebula hits recovered off 12 inch singles and compilations across the globe.
		The Original Dark Nebula duo Luna Orbit and Dave Young come together with an Australian unreleased classic track called "Obsidian Rock"and England's underground cybergenius "Paraphernalien" absolutely rocks with Dark Nebula creating "Generator X".
	www.chaosexistence.net /showproduct.asp?productid=21447 (325 words)

	eSky: Absorption Nebula (Site not responding. Last check: 2007-09-05)
		Unlike emission or reflection nebulae, absorption nebulae cannot normally be seen in visible light, unless they appear against a bright background like the Horsehead or Keyhole Nebulae.
		An absorption nebula is a dense cloud of dust and gas.
		From the point of view of an observer on Earth, it absorbs the light from more distant stars, creating a dark, starless region.
	www.glyphweb.com /esky/concepts/absorptionnebula.html (61 words)

	APOD Index - Nebulae: Dark Nebulae
		Orion, is part of a large, dark, molecular cloud.
		The darkness of the Horsehead is caused mostly by thick dust, although the lower part of the Horsehead's neck casts a shadow to the left.
		Horsehead Nebula's base are young stars just in the process of forming.
	antwrp.gsfc.nasa.gov /apod/dark_nebulae.html (342 words)

	Caltech Astronomy : Palomar Observatory Dark Nebula Lynds 323 Barnard 92
		This dark nebula is known as Lynds 323 (also as Barnard 92).
		The dark regions in the center of the image is a dense cloud that blocks the light of a great many stars.
		Stars that look red in this image are actually embedded within the nebula and have had their light reddened by it.
	www.astro.caltech.edu /palomarnew/b92.html (319 words)

	Snake Nebula (Site not responding. Last check: 2007-09-05)
		In the late 19th Century astronomer E. Barnard cataloged hundreds of dark nebulae.
		Dark nebulae are places in our galaxy where the interstellar dust is so thick that it obscures
		The long twisting nebula is B72, the Snake Nebula.
	www.darkskyimages.com /snake.htm (113 words)

	NGC 1999
		It is a reflection nebula that surrounds the 10th magnitude variable star V380 Ori and is only visible at high magnification.
		It isn't yet clear to me what minimum aperture is required to see the dark patch, although the nebula itself can be seen in telescopes as small as 6 inches.
		In my 18-inch at 94x it appears as nothing more than a "wet star", a roundish haze surrounding a 10th magnitude star, not unlike that seen when there is dew on the optics or moisture in the air.
	www.skyhound.com /sh/archive/jan/NGC_1999.html (284 words)

	Steve Gottlieb; Observing Barnard dark nebulae 7/30/03 at Devastated Lot (Site not responding. Last check: 2007-09-05)
		A wide pair consisting of mag 7.8 SAO 124510 and a mag 10 companion at 54" is at the north edge of the cloud.
		This Barnard dark nebula is not prominent as it is embedded in a larger, low contrast darker cloud.
		These impressive dark nebulae are located ~1.5 degrees west of Gamma Aql.
	observers.org /reports/2003.07.30.3.html (547 words)

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