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	Horsehead Nebula - Wikipedia, the free encyclopedia
		The Horsehead Nebula (also known as Barnard 33 or IC 434) is a dark nebula in the Orion constellation.
		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.
		Streams of gas leaving the nebula are funneled by a strong magnetic field.
	en.wikipedia.org /wiki/Horsehead_Nebula (215 words)

	Nebula - Wikipedia, the free encyclopedia
		A nebula (Latin: "mist"; pl. nebulae or nebulæ, with ligature) is an interstellar cloud of dust, gas and plasma.
		Pinwheel nebula are nebulous regions in the shape of a pinwheel.
		Other nebulae are formed by the death of stars; a star that undergoes the transition to a white dwarf blows off its outer layer to form a planetary nebula.
	en.wikipedia.org /wiki/Nebula (404 words)

	APOD: 2003 July 13 - The Horsehead Nebula (Site not responding. Last check: 2007-10-21)
		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/ap030713.html (129 words)

	APOD Search Results for "horsehead"
		Horsehead Nebula is one of the most famous nebulae on the sky.
		Buried in the complex nebulosity are the bright stars of the Trapezium in Orion's heart, the sweeping lanes of dark dust that cross the center, the pervasive red glowing hydrogen gas, and the blue tinted dust that reflects the light of newborn stars.
		Horsehead Nebula, it is embedded in the vast and complex Orion Nebula.
	antwrp.gsfc.nasa.gov /cgi-bin/apod/apod_search?horsehead (4582 words)

	Nebulae - Zoom Astronomy
		A reflection nebula is a nebula that glows as the dust in it reflects the light of nearby stars.
		The Cygnus loop is a nebula, a supernova remnant in the constellation Cygnus.
		The Orion Nebula is roughly 30 light-years in diameter.
	www.enchantedlearning.com /subjects/astronomy/stars/nebulae.shtml (638 words)

	Horsehead Nebula
		The dark nebula that forms the Horsehead itself is known as Barnard 33 (B 33).
		The reflection nebula NGC 2023 and the emission nebula are NGC 2024 also visible.
		The emission nebula's red color is caused by electrons recombining with protons to form hydrogen atoms.
	members.tripod.com /sc_nebulae/horsehea.htm (132 words)

	eSky: Horsehead Nebula
		The horsehead shape is visible against the glowing pink of the emission nebula IC 434.
		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)

	SPACE.com -- Horsehead Nebula Captured In Stunning New Detail
		The famous Horsehead Nebula, which is situated in the Orion molecular cloud complex.
		A closeup of the Horsehead Nebula from the European Southern Observatory.
		The blue-green regions of the Horsehead Nebula correspond to regions not shadowed from the light from the stars in the H II region to the top of the picture and scatter stellar radiation towards the observer; these are thus "mountains" of dust.
	www.space.com /scienceastronomy/astronomy/horsehead_eso_020128.html (728 words)

	Horsehead Nebula (Site not responding. Last check: 2007-10-21)
		The nebula is a classic dark nebula and may only be seen because it is silhouetted against the very faint glow of IC 434, a reef of tenuous emission nebulosity.
		The Horsehead is believed to a dense cloud of tiny interstellar grains of dust that blocks the light of the emission nebula IC 434 and stars behind.
		While dark nebula are generally invisible (except of course where back lit as in the case of the Horsehead), their dust grains very effectively absorb light and ultraviolet radiation and then re-radiate this energy at infrared wavelengths.
	home.earthlink.net /~deanjacobsen/horsehead.html (420 words)

	B33, The Horsehead Nebula
		The Horsehead Nebula, B33, is the dark nebula in front of the bright red emission nebula IC 434.
		Along with the Orion Nebula, M42, it is part of a very large complex that is a stellar nursery where stars are forming out of the dust and gas.
		The Flame Nebula, NGC 2024, is to the lower left of Alnitak, Zeta Orionis, the easternmost star in the three distinctive stars in the Hunter's belt of Orion, and the brightest star in this photo.
	www.astropix.com /HTML/B_WINTER/B33.HTM (249 words)

	Asterix et Extraterrestres - Horsehead Nebula
		The Horsehead nebula lies south of the bright star Zeta Orionis, which is the easternmost star in the line of three stars that form Orion's Belt.
		The image of the Horsehead nebula, which was used for the "Asterix et Extraterrestres"-banner, was taken with a 0.9-meter telescope at Kitt Peak National Observatory, Tuscon, Arizona.
		Thus, the nebula was voted to be observed by the Hubble Space Telescope to celebrate the 11th anniversary of its launch.
	www.carsten-protsch.de /seti/horsehead.html (236 words)

	Cosmic Voyage-The Online Resource for Amateur Astronomers (Site not responding. Last check: 2007-10-21)
		The Horsehead is a dark nebula (B33) seen in the foreground of a delicate emission nebula (IC 434).
		NGC 2024, an emission nebula with a wide dark channel running north-south through the middle, should be visible about 15' east of Alnitak.
		This is the Flame nebula and is sometimes mistaken for the Horsehead.
	members.aol.com /billferris/horsehead.html (603 words)

	Horsehead Nebula (Site not responding. Last check: 2007-10-21)
		The dark nebula obscuring part of IC 434 is the horsehead nebula, also known as B33.
		The horsehead nebula is one of the most famous examples of a dark nebula, visible because it obscures a glowing cloud of gas that reveals its silhouette.
		The horsehead nebula is located about 1600 light years away, and is a little more than a light year in diameter.
	members.cox.net /sidleach/horsehead.htm (111 words)

	HorseheadNebulatext (Site not responding. Last check: 2007-10-21)
		The famous Horsehead Nebula represents a dark cloud of dust and non-luminous gas which obscures and silhouettes the emitted light of IC 434 behind it.
		The bright emission nebula in the lower left is NGC 2024 (the flame nebula).
		NGC 2023 is one of the brightest reflection nebulae in the sky and is located just east of the Horsehead nebula forming a thin blister at the edge of the molecular cloud L1630.
	www.robgendlerastropics.com /HorseheadNebulatext.html (428 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.seds.org /messier/xtra/ngc/b33.html (312 words)

	Hubble Space Telescope - Wikipedia, the free encyclopedia
		Hubble images of the planet were sharper than any taken since the passage of Voyager 2 in 1979, and were crucial in studying the dynamics of the collision of a comet with Jupiter, an event believed to occur once every few centuries.
		The Horsehead Nebula, selected by the public to be observed by Hubble for its 11th anniversary
		A Heritage Project image of the nebula was released on 24 April 2001, the 11th anniversary of the launch.
	en.wikipedia.org /wiki/Hubble_Space_Telescope (7512 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.
		Along with the Great Orion Nebula M42/43 and its surrounding nebulae, this region is part of a large nebulous complex where stars are forming out of the dust and gas.
		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)

	Horsehead Nebula and NGC 2024 in Orion [encyclopedia]
		This distinctive red emission nebula (IC 434) is the result of radiation from sigma Orionis interacting with the surface of a dusty cloud of gas.
		Partly obscured by the glare of zeta is the curious yellowish nebula NGC 2024, whose energy comes from stars hidden in the dark lane.
		Also visible in the picture are blue reflection nebulae, which simply reflect the light of embedded hot stars and appear blue.
	eluzions.com /Pictures/Java/Horion (290 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.
		One of the most famous objects in the sky, the Horsehead Nebula is a dark nebula only seen because of the reflection nebula, IC 434, that shines brightly behind it.
	www.crystalinks.com /nebula.html (899 words)

	Horsehead Nebula, Flame Nebula and the Orion Belt
		Close by, just to the south, is the renowned Horsehead Nebula, a so-called dark nebula that is not visible in scopes but quite spectacular in long-exposure photographs.
		Infact, excites the hot gases in NGC 2024 (Flame Nebula) causing it to glow in almost unique and beautiful colours, predominantly shell-pink, but ranging from yellow to deep orange.
		The dark central area is caused by a lane of dust in the foreground.
	www.skyfactory.org /orionbelt/orionbelt.htm (461 words)

	SPACE.com -- Happy Birthday to Me: Hubble Celebrates with Horsehead Photo
		The nebula, also known as Barnard 33, is a cold, dark cloud of gas and dust, silhouetted against a bright nebula called IC 434.
		The Horsehead Nebula lies about 1,600 light-years away, just south of the bright star Zeta Orionis, which is easily visible to the unaided eye as the left-hand star in the line of three that form Orion's belt.
		Amateur astronomers often use the Horsehead as a test of their observing skills, in part because it is known as one of the more difficult objects to observe visually with an amateur-sized telescope.
	www.space.com /scienceastronomy/astronomy/hubble_birthday_horsehead_010424.html (539 words)

	Horsehead Nebula (Site not responding. Last check: 2007-10-21)
		The Horsehead Nebula itself, also known as Barnard 33 (B33), is part of an enormous dust cloud that extends to the left and downward in this photo, obscuring light from behind (notice the relative lack of stars in the lower half of the image).
		To the upper right of the Horsehead at 1 o'clock is the bright star Sigma Orionis, which is responsible for producing the UV radiation that excites hydrogen atoms in IC434 to emit in the red.
		To the left of the Horsehead at about 9 o'clock is the large Flame Nebula, aka NGC2024 or Orion B. This is also an emission nebula, although the stars reponsible for its glow are buried deep inside and are not visible.
	www.starrywonders.com /horsehead.html (600 words)

	The Horsehead Nebula (Site not responding. Last check: 2007-10-21)
		The Horsehead Nebula region is perhaps the most beautiful region of the sky.
		In the image below, IC 434 is the bright red emission nebula which feathers across the center of the frame.
		B33 is the designation of the dark nebula of interstellar dust which outlines the shape of a horse head.
	www.koyote.com /users/bobm/horsehead.htm (165 words)

	Horsehead Nebula
		This beautiful close-up view of the Horsehead Nebula shows a dense cloud of dust silhouetted against glowing layers of hydrogen gas.
		This nebula is possibly, after the Moon and Saturn, the most reproduced icon in all of astronomy.
		The nebula surrounding the open star cluster NGC 2264 and its brightest star S Monocerotis is full of dark dust and glowing gas that combine to form intriguing shapes.
	www.shopatsky.com /browseproducts/Horsehead-Nebula.html (893 words)

	The Horsehead Nebula Finder Kit (Site not responding. Last check: 2007-10-21)
		The Horsehead nebula is a dark nebula located in the constellation of Orion.
		Another reason it is a good staring point is because right next to Alnitak is a nebula that will help you gauge the conditions of the skies and whether or not an attempt to see the Horsehead nebula is even worth your time.
		A frequent comment I've heard is that the Horsehead nebula is bigger than the observer imagined it would be.
	www.mindspring.com /~jeffpo/hrsefind.htm (2176 words)

	Nebulae and Star Formation
		The Horsehead Nebula, a part of the optical nebula IC434 and also known as Barnard 33, was first recorded in 1888 on a photographic plate taken at the Harvard College Observatory.
		NGC 2080, nicknamed "The Ghost Head Nebula," is one of a chain of star-forming regions lying south of the 30 Doradus nebula in the Large Magellanic Cloud that have attracted special attention.
		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)

	RedOrbit - Space - Hubble Observes the Horsehead Nebula
		The Horsehead, also known as Barnard 33, is a cold, dark cloud of gas and dust, silhouetted against the bright nebula, IC 434.
		The Horsehead nebula lies just south of the bright star Zeta Orionis, which is easily visible to the unaided eye as the left-hand star in the line of three that form Orion's Belt.
		Amateur astronomers often use the Horsehead as a test of their observing skills; it is known as one of the more difficult objects to see visually in an amateur-sized telescope.
	www.redorbit.com /news/display/?id=22...ource=r_general (510 words)

	The Horsehead Nebula is Rotating by Ken Croswell
		The Horsehead Nebula in Orion is rotating, say radio astronomers in France, Holland, and Germany.
		Resembling a cosmic chess piece, the Horsehead is one of the most famous nebulae in the sky.
		Lots of cores of clouds rotate, but the fact that the whole inner core of the Horsehead is rotating is quite unusual--because that's a very large structure." The Horsehead is two light-years long, half the distance from the Sun to Alpha Centauri.
	www.sonic.net /~antares/HorseheadNebulaIsRotating.html (651 words)

	Horsehead Nebula (Site not responding. Last check: 2007-10-21)
		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.
		This region is actually just part of a much larger cloud that covers most of the constellation of Orion (including the region around the Orion Nebula).
	astro.nineplanets.org /twn/b33x.html (102 words)

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