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Topic: Orion Nebula

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Reflection nebula

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Trifid Nebula

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Horsehead Nebula

	Messier Object 42
		The Orion Nebula Messier 42 (M42, NGC 1976) is the brightest starforming, and the brightest diffuse nebula in the sky, and also one of the brightest deepsky objects at all.
		The Orion Nebula was probably discovered in late 1610, when Nicholas-Claude Fabri de Peiresc (1580-1637), a French lawyer, turned his telescope to this region of the sky, and reported of a cloudy nebulosity.
		As the drawings of the Orion Nebula known to him did so poorly represent Messier's impression, he created a fine drawing of this Object, in order to "help to recognize it again, provided that it is not subject to change with time" (as Messier states in the introduction to his catalog).
	www.seds.org /messier/m/m042.html (1957 words)

	The Orion Cloud and Association
		The stars of the Orion Nebula, M42 and M43, form a subset of this group, and are sometimes separately counted as subgroup 1d, the very youngest stars of the Orion OB1 association.
		The bright nebula near the bottom is the Great Orion nebula M42 with its northern part M43 and northern extension NGC 1973-5-7.
		At the upper left is the nebula complex around the star Zeta Orionis, consisting of bright Orion B (NGC 2024) left of the star, and IC 434 with the conspicuous dark Horsehead Nebula, plus various small nebulae.
	www.seds.org /messier/more/oricloud.html (693 words)

	Orion Nebula - Picture - MSN Encarta
		Located in the constellation Orion, 1600 light years away from earth, the Orion Nebula (M 42) is a bright cloud of gas and dust where stars are in the process of being born.
		The Orion Nebula looks bright because it reflects light from the multiple star Theta Orionis, located on one side.
		Radiation from new stars in the Nebula lights up hydrogen in its outer regions, causing the gas to glow with its characteristic red color.
	encarta.msn.com /media_461533132/Orion_Nebula.html (88 words)

	Volume Visualization of the Orion Nebula
		The Orion Nebula is an example of an emission nebula.
		Voxels within the glowing parts of the nebula are made opaque and given a color based upon specially color-corrected Hubble imagery (color correction removes the reddening effects of dust and gas between Earth and the nebula).
		The volumetric model was used to render images of the nebula as seen from the point of view of a spacecraft flying through the nebula.
	vis.sdsc.edu /research/orion.html (1182 words)

	Orion Nebula (M42, NGC 1976)
		It is visible to the naked eye south of Orion's Belt as a fuzzy patch known as Orion's Sword.
		Lying at a distance of about 1,450 light-years in the constellation Orion, and measuring about 30 light-years across, the Orion Nebula is ionized and made visible by a small group of O stars and B stars known as the Trapezium cluster.
		A study of the polarization of light in a region of the Orion Nebula has provided a clue to the origin of "handedness" in some of the chemical building blocks of terrestrial life (see chirality).
	www.daviddarling.info /encyclopedia/O/OrionNeb.html (240 words)

	Orion The Hunter (Site not responding. Last check: )
		The Belt and Sword Region of Orion: The Orion Nebula is visible to the upper right; the Flame and Horsehead Nebulae to the lower left.
		This is M-42, the Orion Nebula, and is one of the most beautiful, and most photographed, objects in the night sky.
		The Orion Nebula is also one of the most active stellar nurseries in our galaxy; new stars are forming within the gas cloud.
	sciastro.net /portia/articles/orion.htm (773 words)

	Orion Constellation
		Orion is a wonderfully distinctive arrangement of stars that brighten the night sky from December to April.
		The Great Nebula (M 42), also called the Orion Nebula, is a wonderful star nursery that is visible to the naked eye under a dark sky.
		The Latin word for cloud, nebula, is the term used for the cosmic gas and dust that lie among the stars.
	donnayoung.org /science/stars/orion.htm (377 words)

	Exploring News & Features - Latest investigations of Orion Nebula reduce odds of planet formation (Site not responding. Last check: )
		The Orion nebula is the closest example of a stellar nursery.
		The nebula in Orion is 1,500 light years from Earth and six light years or 35 trillion miles across.
		Orion’s massive central stars must be even younger, O’Dell contends because they have created an intense radiation environment that has essentially shut down star formation in the nebula.
	exploration.vanderbilt.edu /news/news_orion.htm (851 words)

	Orion Nebula (Site not responding. Last check: )
		The Orion Nebula is a region filled with hot gas and dust, the raw materials for building new stars.
		It is located in the area of the sword of Orion the Hunter, a constellation named by ancient Greeks that dominates the northern hemisphere winter sky.
		Nebula: a cloud of interstellar gas and dust, seen either as a luminous patch of light or a dark cloud against a bright background.
	teacherlink.ed.usu.edu /tlnasa/pictures/litho/orion/index.html (511 words)

	Orion - Crystalinks
		Orion as a constellation is the head of a constellation family, located in the equatorial region of the sky and belongs certainly to the most famous constellations.
		The "belt and sword" of Orion are frequently referred to in ancient and modern literature, and even found recognition as the shoulder insignia of the 27th Infantry Division of the United States Army during both World Wars, probably because the division's first commander was Major General John F. O'Ryan.
		In some depictions, Orion appears to be composed of three bodies, having three arms, two divergent legs, and a small central one, as well as the three bodies being bound at the waist.
	www.crystalinks.com /orion.html (1769 words)

	Hawaiian Astronomical Society - Orion
		Orion was the son of Poseidon (the sea god) and Euryale (one of the Gorgons' sisters).
		Orion fell madly in love with her and asked her father for permission to marry her.
		Orion boasted he was the greatest hunter in the universe.
	www.hawastsoc.org /deepsky/ori/index.html (1870 words)

	Orion Nebula - Search Results - MSN Encarta
		Orion Nebula, glowing cloud of interstellar gas near the celestial equator in the constellation Orion, at approximate position right ascension 5h...
		Nebula, a localized mass of the gases and finely divided dust particles that are spread throughout interstellar space.
		Orion (astronomy), constellation located on the celestial equator east of Taurus.
	uk.encarta.msn.com /Orion_Nebula.html (125 words)

	eSky: Orion
		Orion contains some of the best known stars in the sky, with perhaps the most famous being the variable red giant Betelgeuse, which marks Orion's left shoulder.
		In the direction of the constellation of Orion is the dense heart of this galactic arm, and so this part of the sky is filled with nebulous regions.
		The most prominent of these is the diffuse nebula at the centre of the Sword of Orion, sometimes simply called the Great Nebula, but more commonly known as the Orion Nebula.
	www.glyphweb.com /esky/constellations/orion.html (645 words)

	orion (Site not responding. Last check: )
		Orion's head is marked by the trio of stars at the top of the picture just left of center, the brightest of which is Meissa.
		The the red glow in the middle of Orion's Sword is the Orion Nebula, which is lit by Theta-1 Ori.
		Orion's upraised club, topped by Chi-1 and Chi-2 Ori, rises off the picture at upper left; the two "Chi-stars" are visible on the images of both Gemini and Taurus.
	www.astro.uiuc.edu /~kaler/sow/orion-p.html (301 words)

	Orion - Astronomy for Kids
		Orion is one of the largest constellations in the sky and is also one of the easiest to find.
		Orion is also home to one of the most beautiful objects in the night sky, the Orion Nebula.
		This nebula is also one of the very few places in the sky where the Hubble Space Telescope has been able to spot disks of dust around some the the young stars.
	www.dustbunny.com /afk/constellations/orion (629 words)

	Orion Nebula shines in its grandest portrait - Space.com - MSNBC.com
		Orion is located 1,500 light-years away and is the nearest region of massive star formation.
		Located at the center of the Orion Nebula are a group of four young, massive stars; they are collectively referred to as the "Trapezium" because of the shape they make.
		O'Dell used Hubble to map Orion's stellar winds with unprecedented detail; he discovered that the shock waves can have different shapes, depending on whether the dust and gas clouds were moving or stationary when the winds passed through.
	www.msnbc.msn.com /id/10806310 (708 words)

	Orioncloudtext
		The Orion Molecular cloud is comprised of two distinct giant molecular clouds known as the Orion A and Orion B clouds, named after the HII regions formed within them (Orion A = M42, Orion B = NGC 2024).
		A dense ridge-like structure exists within the molecular gas of the Orion A and B clouds and represents the location of distinct cores of hot gas and dust where concentrated star formation is occurring.
		Star formation in the Orion clouds has almost certainly occurred by way of external sequential triggering where the supernovae and stellar winds of one generation have triggered the collapse of adjacent molecular clouds and the subsequent formation of a new generation of stars.
	www.robgendlerastropics.com /Orioncloudtext.html (670 words)

	Orion
		Orion is the master of the winter skies.
		Generally speaking, Orion was known as the "dweller of the mountain", and was famous for his prowess both as a hunter and as a lover.
		M42, The Orion Nebula is perhaps the most photographed deep sky object in the heavens, a vast nebula of gas and dust exquisitely lit by surrounding stars.
	www.dibonsmith.com /ori_con.htm (1356 words)

	M42 - Orion Nebula
		The entire nebula is a region of star formation; the open star cluster associated with the nebula is only about 500,000 years old, one of the youngest known.
		The central portion of the nebula is bright enough to activate the color receptors in the retina when viewed in moderate to large aperture telescopes.
		It is sometimes called the Running Man Nebula because of the distinctive dust pattern which resembles the profile of a running person (you may need to tilt your head toward your left shoulder to recognize it).
	webpages.charter.net /alsonwongweb/m42-orio.htm (364 words)

	ORION NEBULA (Site not responding. Last check: )
		Orion is one of the most easily identifiable constellations in the night sky.
		Orion fell in love with Merope, the daughter of Oenopion, King of Chios and sought her in marriage.
		Orion consulted an Oracle, who told him to go to the east and let the rays of the rising sun bathe his eyes.
	www.mikekemble.com /space/orion.html (645 words)

	Revisiting The Orion Nebula
		Orion the Hunter is perhaps the best-known constellation in the sky, well placed in the winter for observers in both the northern and southern hemispheres, and instantly recognisable.
		Bright enough to be seen with the naked eye, the nebula, also known as Messier 42, is a wide complex of gas and dust, illuminated by several massive and hot stars at its core, the famous Trapezium stars.
		In fact, located at a distance of 1500 light years, the Orion Nebula plays such an important role in astrophysics that it can be argued that our understanding of star formation is for a large part based on the Orion Nebula.
	www.spacedaily.com /news/stellar-chemistry-04d.html (632 words)

	Spaceflight Now \| Breaking News \| Remarkable new views captured of Orion Nebula
		Orion the Hunter is perhaps the best known constellation in the sky, well placed in the evening at this time of the year for observers in both the northern and southern hemispheres, and instantly recognisable.
		And for astronomers, Orion is surely one of the most important constellations, as it contains one of the nearest and most active stellar nurseries in the Milky Way, the galaxy in which we live.
		The dusty disk itself is seen edge-on as a dark streak against the background emission of the Orion Nebula, while the bright fuzzy patches on either side betray the presence of the embedded parent star that illuminates tenuous collections of dust above its north and south poles to create these small reflection nebulae.
	spaceflightnow.com /news/n0101/19orion (1812 words)

	APOD: February 1, 1998 - NGC 1977: Blue Reflection Nebula in Orion (Site not responding. Last check: )
		Explanation: The Orion Nebula is visible to the unaided eye as a fuzzy patch near the famous belt of three stars in the
		Orion Nebula that primarily reflects light from bright Orion stars.
		This reflection nebula appears blue because the blue light from the neighboring stars scatters more efficiently from nebula gas than does red light.
	www.phy.mtu.edu /apod/ap980201.html (113 words)

	Universe Today - The Next Orion Nebula
		Wed, 11 Jan 2006 - The Orion Nebula is one of the most magnificent objects in the night sky, but it won't last forever.
		The Orion Nebula is one of the most famous and easily viewed deep-sky sights.
		"Orion may seem very peaceful on a cold winter night, but in reality it holds very massive, luminous stars that are destroying the dusty gas cloud from which they formed," said Megeath.
	www.universetoday.com /am/publish/next_orion_nebula.html?1112006 (976 words)

	Nebula, Orion Nebula, Crab Nebula, Nebulas, Planetary Nebula at SPACE.com
		Nebula, Orion Nebula, Crab Nebula, Nebulas, Planetary Nebula at SPACE.com
		Nebulas are generally classified according to the degree of luminosity.
		Prior to the invention of research tools like the telescope, the term nebula was used to describe any celestial object with a diffused appearance, as a result many objects now known to be star clusters or galaxies were originally classified as nebulas.
	www.space.com /nebulas (338 words)

	Orion Nebula
		The Orion Nebula is easily visible with the naked eye as the middle star in Orion's "sword".
		The Orion Nebula is the nearest star formation region to the Earth and consequently particularly well studied.
		The Orion Nebula is actually just part of a much larger cloud that covers most of the constellation of Orion (including the region around the Horsehead Nebula).
	astro.nineplanets.org /twn/n1976x.html (198 words)

	Infrared Legacy Gallery - Orion Nebula Caption (Site not responding. Last check: )
		In the constellation of Orion, the hunter's belt is seen as three distinctive stars in a row.
		A giant stellar nursery, the Orion nebula is home to thousands of young stars, some of which are known to have disks of dust that may be forming new planets.
		In fact, the visible part of this nebula is just the glowing tip of a much larger cloud of dust and gas extending up and to the left.
	coolcosmos.ipac.caltech.edu /image_galleries/legacy/2m_orion/caption.html (272 words)

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