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	Omega Nebula (Site not responding. Last check: 2007-10-12)
		The Omega Nebula (also known as the Swan Nebula, M17 or NGC 6618) is an H II region in the constellation Sagittarius.
		The distance to the Omega Nebula is between 5,000 and 6,000 light-years and it spans some 15 light-years in diameter.
		The total mass of the Omega Nebula is an estimated 800 solar masses.
	en.askmore.net /Omega_Nebula.htm (138 words)

	M17 (Site not responding. Last check: 2007-10-12)
		The Omega Nebula M17, also called the Swan Nebula, the Horseshoe Nebula, or (especially on the southern hemisphere) the Lobster Nebula, is a region of star formation and shines by excited emission, caused by the higher energy radiation of young stars.
		The color of the Omega nebula is reddish, with some graduation to pink, and the brightest region is actually of white color, not overexposed as one might think.
		While the bright nebula seems to be roughly 15 light years in extension, the total gaseous cloud, including low-luminosity material, seems to extend to at least 40 light years.
	www.intercom.net /user/shaffer/messier/m17.html (314 words)

	Nebulae (Site not responding. Last check: 2007-10-12)
		Bright nebula are clouds of interstellar gas and dust that glow with light emitted by the gas (emission nebulae) or by reflected starlight (reflection nebulae) or both.
		Dark nebulae consist of clouds of gas and dust that are not illuminated and appear as dark areas against a brighter background.
		The Dumbbell Nebula (M27) in Vulpecula is classified as a planetary nebula.
	home.alltel.net /ronccd/WebPg.4.Nebulae.htm (262 words)

	index
		The Omega Nebula is a massive, complex cloud of dust and gas from which new stars are continually forming.
		The Omega Nebula is said to consist out of more matter than the Orion Nebula; the whole matter of the nebula could form about 800 stars as big as our sun.
		M17 is a bright nebula which is excited to shine by young stars which are borne inside the nebula.
	www.eso.org /outreach/eduoff/edu-prog/catchastar/CAS2002/cas-projects/germany_m17_1/basicinf.htm (325 words)

	M-17, Omega Nebula (Site not responding. Last check: 2007-10-12)
		It is known as the "Omega Nebula" or the "Swan Nebula".
		Sir William Huggins, in 1866, was the first to study the light of M-17 with the spectroscope; he announced that the cloud was truly a mass of glowing gas, and not merely an unresolved cluster of stars.
		It requires only the slightest use of the imagination to transform this pattern into the graceful figure of a celestial swan floating in a pool of stars.......The space enclosed by the neck of the swan is evidently an obscuring cloud of some sort, and looks quite dark when compared to the star-strewn sky beyond.
	www.kopernik.org /images/archive/m17.htm (368 words)

	M16 and M17 - The Eagle and Omega Nebulae
		The Eagle nebula (M16) is the largest of the two nebulae, although the name M16 (or NGC 6611) is often used only for the bright central region of the nebula and IC 4703 is used for the entire nebula.
		The Omega nebula is known to be situated at the northeast end of a huge (and dark) molecular cloud that stretches across several hundred light years.
		The Omega nebula (M17) is about 4250 light years away and it is probably closer to the Lagoon nebula than to Eagle nebula.
	www.atlasoftheuniverse.com /nebulae/m16m17.html (868 words)

	M17 The Omega Nebula (Site not responding. Last check: 2007-10-12)
		The Omega Nebula is 5,700 light-years away in Sagittarius.
		The Omega Nebula was discovered by Swiss astronomer de Cheseaux in 1764.
		The Omega Nebula is also known as the Swan Nebula.
	members.cox.net /~sidleach/m17.htm (126 words)

	MSX Showcase: Omega Nebula (Site not responding. Last check: 2007-10-12)
		The Omega Nebula is a region of star formation which is about 5,000 light years from Earth.
		It is an emission nebula which glows because its atoms are energized by ultraviolet radiation from the hot, young stars embedded within it.
		The stars in the Omega Nebula are difficult to see with optical telescopes because they are surrounded by dense clouds of gas and dust.
	coolcosmos.ipac.caltech.edu /image_galleries/MSX/omega_nebula.html (137 words)

	Gallery - The Omega Nebula, M17 - RedOrbit (Site not responding. Last check: 2007-10-12)
		The Omega Nebula, Messier object 17 (M17), NGC6618, in the constellation Sagittarius, as seen by the Kitt Peak 4-meter Mayall telescope in 1973.
		The Omega Nebula, Messier object 17 (M17), NGC 6618, in the constellation Sagittarius, as seen by the Kitt Peak 4-meter Mayall telescope in 1973.
		This bright nebula, criss-crossed by clouds and lanes of opaque dust and gas, is also known as the Swan Nebula and the Horseshoe Nebula.
	www.redorbit.com /images/gallery/nebulae/the_omega_nebula_m17/113/64/index.html (173 words)

	The Universe within 5000 Light Years - The Orion Arm (Site not responding. Last check: 2007-10-12)
		The Eta Carinae nebula is a massive region of star formation in the Sagittarius arm of the Galaxy, and it surrounds the extremly massive star Eta Carinae.
		The Trifid nebula is close to the Lagoon nebula although it is slightly smaller and dimmer.
		The Eagle and Omega nebulae are another pair of bright nebulae in the Sagittarius Arm where many stars are being born.
	anzwers.org /free/universe/5000lys.html (705 words)

	The Omega Nebula M17
		The gaseous nebula (H II region) Messier 17 (NGC 6613) in northern Sagittarius, shown from a 30-second red-light exposure (through clouds) with a Tektronix 2048x2048 CCD at the prime focus of the 4-meter Mayall telescope of Kitt Peak National Observatory.
		North is at the top and east to the left, for direct comparison with a chart or eyepiece view.
		Especially prominent dust clouds appear at the western (right) edge of this picture, but the whole area is loaded with dust and molecular gas that are not so prominent visually.
	www.astr.ua.edu /gifimages/m17r.html (203 words)

	M17 - The Omega Nebula (Site not responding. Last check: 2007-10-12)
		The Omega Nebula (M17) is located in the constellation Sagittarius.
		More information about this nebula can be found at the Messier Index - M17 and at the Web Nebulae - M17.
		The image is a 30-minute exposure at the prime focus of a 16" f/4.5 Newtonian using hypered Fuji 800 film taken on 31 July 1997.
	www.astroimages.org /astrophotos/m17-18-8.html (102 words)

	* M17 - (Astronomy): Definition
		This Cluster with Nebula has an apparent angular size of 11 and a visual brightness of 7.
		Omega Nebula in Sagittarius was discovered by de Cheseaux in 1746 and Messier observed it on June 3, 1764.
		One of the most impressive objects to me is the Swan Nebula M17 as seen with the "BinoViewer", sitting back on a lounge-chair and spending time enjoying all the swirls and deep contrast.
	en.mimi.hu /astronomy/m17.html (414 words)

	NCKAS -Nebula
		NGC 3242 is such a planetary nebula, with the stellar remnant white dwarf star visible at the center.
		Nebula are some of the most striking and beautiful of all the objects in the sky and are considered "Deep Sky Objects" or DSO's because they tend be be very dim and diffuse.
		This complex is an emission nebula (clouds of gas, exited and glowing from the radiation of hot O and B stars) and an impressive open cluster.
	www.nckas.org /nebulae (2194 words)

	SUMMER SKIES NEBULAE
		The 12' x 12' nebula is embedded in a 12' diameter open cluster of 76+ young stars, down to magnitude 17.5.
		This nebula is centered very near the apex of several “dark lanes” in the otherwise rich CYGNUS milky way star fields.
		The nebula clouds are suggestive to me of a large bird, head down with wings spread and tail fanned out to catch and sail the thermals of the brilliant night skies.
	pages.prodigy.net /fmewalt/photo2.html (1095 words)

	M17 The Swan Nebula
		M17, also called the Swan Nebula and sometimes the Omega Nebula, is a region of star formation and shines by excited emission caused by the high-energy radiation of young stars.
		Unlike many other emission nebula, however, these stars are not obvious in optical images, but are hidden in the nebula.
		While the bright nebula seems to be roughly 15 light years across, the total gaseous cloud, including low-luminosity material, extends to at least 40 light years.
	www.waid-observatory.com /m017-2005-06-017.html (255 words)

	Messier M17: The Omega Nebula
		Located in Sagittarius, M17 is an open cluster with bright nebula also known as the Swan, or Lobster, Nebula, and sometimes as the Horseshoe Nebula in the Southern Hemisphere.
		It is close to the Eagle Nebula, M16, in the next, inner, arm of our Milky Way Galaxy to us.
		It is a region new star formation and one of the brightest emission nebulæ in the infra-red, shining as a result of the young stars within it.
	www.r-clarke.org.uk /messier/m17.htm (86 words)

	M 17
		Unlike in many other emission nebulae, however, these stars are not obvious in optical images, but hidden in the nebula.
		The color of the Omega nebula is reddish, with some graduation to pink.
		Distance estimates are spread over a wide range, but modern values are between 5,000 and 6,000 light years, thus little less than that of its apparent neighbor, M16 with the Eagle nebula -- apparently, these two star forming regions are indeed close together, in the same spiral arm of the Milky Way galaxy.
	www.messiermarathon.com /new_page_23.htm (367 words)

	Messier Object 16
		A deeper insight in the star formation process could be obtained from the HST images of M16, published in November 1995; moreover, they were used for an animation simulating the approach to this star forming region, and we provide some screen sized images (suitable as backgrounds for your computer screen).
		The nebula was added in the IC II of 1908 as IC 4703, with "cluster M16 involved", but the NGC 2000.0 erroneously classifies this object as an open cluster.
		The nebula was probably first photographed by E.E. Barnard in 1895, and by Isaac Roberts in 1897.
	www.seds.org /messier/m/m016.html (697 words)

	M17 Omega Nebula eso (Site not responding. Last check: 2007-10-12)
		is a gaseous nebula known as an H II region, a molecular cloud of ionized hydrogen.
		Popularly called the Omega Nebula because of the similarity to the Greek letter capital Omega, it is also known as the Swan and the Horseshoe.
		It is very low in the southern summer sky for northern observers and is a little less than 0.5 degrees in overall size.
	www.sonic.net /~ganymede/Astro/Nebulae/Messier/pages/M17Omegaeso.htm (82 words)

	M17, The Omega Nebula
		After M42, the Omega Nebula is the brightest galactic nebula in the northern sky and is located just to the north of M24 (the small Sagittarius Star cloud) in the summer Milky Way, and is about 5,000 to 6,000 light years distant.
		M17 can be easily seen in binoculars and in a telescope the brighter portion of the nebula has the very distinctive shape of a swan, or the greek letter Omega, or a horseshoe, hence its popular names.
		As with most bright emission nebulae, M17 is a large concentration of hydrogen gas and dust in space.
	www.astropix.com /HTML/D_SUM_S/M17.HTM (304 words)

	Nebulae
		The dark dust filaments that lace the center of Omega Nebula were created in the atmospheres of cool giant stars and in the debris from supernova explosions.
		While the Cone Nebula, about 2,500 light-years away in Monoceros, is around 7 light-years long, the region pictured here surrounding the cone's blunted head is a mere 2.5 light-years across.
		This emission nebula's bright central regions were captured on fast film in a relatively short 30-second exposure.
	members.tripod.com /~totherow/index-31.html (1135 words)

	Omega Nebula
		M17, the Omega (or Swan) Nebula, in hydrogen alpha light.
		This is a region of star formation and shines by excited emission, caused by the higher energy radiation of young stars.
		This nebula is more massive than the Orion Nebula and is more than 40 light years across.
	www.angelfire.com /space2/tgtan/Omega_Ha_dslr.htm (245 words)

	Chandra :: Photo Album :: M17 :: 14 Aug 03
		A group of massive young stars responsible for the activity in the nebula is located in the bright pink region near the center of the image.
		The stars in the Horseshoe Nebula are only about a million years old, so the nebula is too young for one of its stars to have exploded as a supernova and heated the gas.
		Collisions between high-speed winds of particles flowing away from the massive stars could heat the gas, or the hot gas could be produced as these winds collide with cool clouds to form bubbles of hot gas.
	chandra.harvard.edu /photo/2003/m17/index.html (354 words)

	Messier 17, the Omega Nebula (NOAO image)
		This is a ground-based overview of the Omega or Swan Nebula.
		The outline of the field observed by the NASA/ESA Hubble Space Telescope is shown.
		Omega Nebula, Swan, Lobster Nebula, M 17, NGC 6618, Messier 17
	www.spacetelescope.org /images/html/heic0305b.html (36 words)

	Deepsky observing report M16, M17, M18, M24, M22, M8, M11, IC 4756, NGC 6633, NGC 253, NGC 247, NGC 188, NGC 891
		The milky was visible overhead, spanning the sky from the east to the west.
		The nebula is about 120′x 25′ but I could only detect the central part, an area of 10′x 15′ at maximum.
		This beautiful object, a combination of an emission nebula (NGC 6618) and open cluster (also NGC 6618), was discovered by Chesaux in the spring of 1746, before it was rediscovered by Messier in June of the same year.
	www.backyard-astro.com /deepsky/2003_09_26/ITT.html (2672 words)

	APOD: 2002 May 1 - In the Center of the Omega Nebula (Site not responding. Last check: 2007-10-12)
		Explanation: In the depths of the dark clouds of dust and molecular gas known as the Omega Nebula, stars continue to form.
		Omega Nebula were created in the atmospheres of cool
		The red and blue hues arise from glowing gas heated by the radiation of massive nearby stars.
	apod.gsfc.nasa.gov /apod/ap020501.html (152 words)

	Image of the Day: Omega Nebula
		The Omega Nebula, also known as M17 or NGC6618, is in the constellation Sagittarius.
		It is a bright emission nebula whose gas and dust is excited by young stars.
		M17 is also referred to as the Swan Nebula and the Horseshoe Nebula.
	www.space.com /imageoftheday/image_of_day_030417.html (135 words)

	Black Dog Observatory - CCD imaging of deep space objects - Omega Nebula (Site not responding. Last check: 2007-10-12)
		Other names for this quite stunning nebula are, The Swan, The Horseshoe, The Checkmark and in the southern hemisphere, The Lobster Nebula.
		It is a bright emission nebula in the constellation Sagittarius that is part of an enormous cloud of gas in which star formation is believed to be still going on.
		The visible part of the nebula is quite small at 15 light years across.
	users.bigpond.net.au /BlackDogObservatory/nebulae/omega.html (133 words)

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