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Topic: Reflection nebula

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Diffuse nebula

Nebula

Trifid Nebula

Orion Nebula

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	Астронет > NGC 1999: Reflection Nebula In Orion
		Астронет > NGC 1999: Reflection Nebula In Orion
		Публикации с ключевыми словами: nebula - Orion - reflection nebula - bok globule
		Публикации со словами: nebula - Orion - reflection nebula - bok globule
	www.astronet.ru /db/msg/1162687 (228 words)

	Reflection nebula
		In astronomy, 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, an example of this is the Orion Nebula.
		Among the nicest of the reflection nebulae are those surrounding the stars of the Pleiades.
	www.ebroadcast.com.au /lookup/encyclopedia/re/Reflection_nebula.html (246 words)

	Sea and Sky's Cosmic Wonders: Nebulae
		Indeed, a nebula is a cosmic cloud of gas and dust floating in space.
		The nebula is illuminated by a group of stars at its center known as the trapezium.
		The nebula is illuminated by the 16th magnitude star remnant at its center.
	www.seasky.org /cosmic/sky7a05.html (1150 words)

	Reflection nebula - Wikipedia, the free encyclopedia
		The Witch Head reflection nebula (IC2118), about 1000 light years from earth, is associated with the bright star Rigel in the constellation Orion.
		Thus, the frequency spectrum shown by reflection nebulae is similar to that of the illuminating stars.
		Reflection nebulae and emission nebulae are often seen together and are sometimes both referred to as diffuse nebulae.
	en.wikipedia.org /wiki/Reflection_nebula (413 words)

	B33, The Horsehead Nebula
		The Horsehead Nebula, B33, is the dark nebula in front of the bright red emission nebula IC 434.
		Reflection nebulae do not shine by their own light, but are visible because they reflect the light of nearby stars.
		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)

	Nebula
		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 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 b oth referred to as diffuse nebulae.
	www.crystalinks.com /crabnebula.html (620 words)

	GARY'S HOME PAGE
		Emission nebulae are usually red in color because the majority of atom emissions from hydrogen appear as red.(various colors are produced by other atoms, but hydrogen atoms are the most prominent, and abundant, atoms in emission nebulae) Emission nebulae appear at the locations of recent and ongoing star formation.
		Reflection nebulae are clouds of dust which reflect the light of a nearby star or stars.
		Reflection nebulae and emission nebulae are often seen together and when both are present at a site, they are sometimes referred to as diffuse nebulae.
	www.du.edu /~gjlee/final.html (1632 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)

	APOD Index - Nebulae: Reflection Nebulae
		The nebula, cataloged as NGC 1999, is a reflection nebula, which shines by reflecting light from a nearby star.
		Unlike emission nebulae, whose reddish glow comes from excited atoms of gas, reflection nebulae have a bluish cast as their interstellar dust grains preferentially reflect blue starlight.
		While perhaps the most famous reflection nebulae surround the bright young stars of the Pleiades star cluster, NGC 1999's stellar illumination is provided by the embedded variable star V380 Orionis, seen here just left of center.
	antwrp.gsfc.nasa.gov /apod/reflection_nebulae.html (432 words)

	Reflection Nebulas (Site not responding. Last check: 2007-10-14)
		Reflection nebulas are huge clouds of dust which reflect the light of nearby stars.
		Reflection and emission nebulas are often seen together.
		The picture at left is of IC349 which is a reflection nebula in the Pleiades star cluster.
	www.synapticsystems.com /sky/wonders/nebula4.html (145 words)

	eSky: Nebula (Site not responding. Last check: 2007-10-14)
		Though they can exist in many forms, nebulae tend to be associated with the beginnings and endings of stars.
		Nebulae form the raw material for the formation of stars, but are also created by material 'cast off' by stars in their final stages of life.
		A typical Reflection Nebula - clouds of interstellar material are illuminated by the two bright stars in the foreground.
	www.glyphweb.com /esky/concepts/nebula.html (74 words)

	Deep Sky Object - Nebulae (Site not responding. Last check: 2007-10-14)
		Nebulae are a cloud of interstellar gas and dust.
		Planetary nebulae are shells of gas thrown out by some stars near the end of their lives (used up all its central nuclear fuel, it finally ejects a significant portion of its mass in a gaseous shell).
		These nebulae quickly expand and fade while their matter is spread in the interstellar surroundings.
	www.croastro.com /htmlinfo/nebulae.htm (386 words)

	APOD: March 1, 1999 - Reflection Nebula NGC 1435 (Site not responding. Last check: 2007-10-14)
		Reflection nebulae reflect light from a nearby star.
		carbon grains in the nebula reflect the light.
		The brightness of the nebula is determined by the size and density of the reflecting grains, and by the color and brightness of the neighboring star(s).
	antwrp.gsfc.nasa.gov /apod/ap990301.html (143 words)

	Kids' Astronomy -- Nebulae - Astronomy
		Reflection nebula: A reflection nebula glows because it reflects the light of nearby stars.
		Reflection nebulae are usually blue, and are often home to forming stars.
		Dark nebula: A dark nebula is a cloud of dust that blocks the light of anything behind it.
	www.bellaonline.com /articles/art43575.asp (311 words)

	M-78, Reflection Nebula in Orion
		This faint reflection nebula is separated from the main body of M-78 by a dark dust lane.
		This reflection nebula appears to be reflecting light from the same B-type giant stars as M-78 itself.
		Other reflection nebulae in the area include NGC 2064 in the middle of our picture and the large but dim NGC 2071 that lies just off the top of the image.
	www.kopernik.org /images/archive/m78.htm (419 words)

	Nebulae -- Birthplace of Stars - Astronomy
		Emission nebulae are frequently home to forming stars--as gravity causes some of the nebula’s dust and gas to pull together, it contracts into a smaller, denser body, and after millions of years, the mass reaches a hot enough temperature to shine.
		Reflection nebulae: A reflection nebula forms near a cool star, whose ultraviolet light is too weak to interact with the nebula’s hydrogen atoms.
		A dark nebula has a similar physical structure as a reflection nebula, and are often a few hundred light-years across.
	www.bellaonline.com /articles/art43407.asp (375 words)

	Reflection Nebulae (Site not responding. Last check: 2007-10-14)
		Most reflection nebulae are blue because the tiny particles of dust that reflect are very small.
		Some, however strongly reflect the light of the star that illuminates them, such as that around Antares in UKS 30, while others reflect a brief flash of starlight from a supernova, such as the light echo of supernova 1987A, seen in AAT 66.
		In one case, the dust is reflecting the light of another nebula, that in Orion, and there is no blue light to reflect, so the reflection nebulosity in UKS 25 appears yellow.
	triton.elk.itu.edu.tr /~batman/astronom/astro_img/reflection.html (115 words)

	Newswise
		The discovery of a new type of low-surface-brightness reflection nebula around aging stars has provided important clues about how stars lose mass and form planetary nebulae.
		In the first type of structure -- never before observed in proto-planetary nebulae -- a bright, central star is embedded in a faint, elliptically elongated shell of gas and dust.
		Meixner and her colleagues suggest that the axisymmetry found in proto-planetary nebulae could be created by an equatorially enhanced stellar superwind.
	www.newswise.com /articles/view/?id=NEBULA.UIL (467 words)

	Messier Object 78
		M78 is the brightest diffuse reflection nebula in the sky.
		As a reflection nebula, M78 is a cloud of interstellar dust which shines in the reflected and scattered light of bright blue (early B-type) stars, among them the brightest, HD 38563A, and second-brightest HDE 38563B, both of about 10th visual apparent magnitude.
		The nature of M78 as a reflection nebula was discovered by Vesto M. Slipher of Lowell Observatory in 1919 (Slipher 1919).
	www.seds.org /messier/m/m078.html (863 words)

	NASA - Nebula
		A nebula (NEHB yuh luh) is a cloud of dust particles and gases in space.
		If a diffuse nebula occurs in an area that has no nearby stars, it neither emits nor reflects enough light to be visible.
		Planetary nebulae are ball-like clouds of dust and gases that surround certain stars.
	www.nasa.gov /lb/worldbook/nebula_worldbook.html (563 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)

	reflection nebula concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-14)
		The emission component of its spectrum is due to gas; the reflection component, to dust (see also diffuse nebula).
		cometary nebula (1 kind, 6 facts) - A reflection nebula with a fan shape that bears a superficial resemblance to a comet.
		Classical examples of the heads of cometary nebulae are R Mon, R CrA, and RY Tau.
	www.site.uottawa.ca:4321 /astronomy/reflectionnebula.html (159 words)

	Reflection - Search Results - MSN Encarta
		Reflection, in physics, phenomenon of wave motion, in which a wave is returned after impinging on a surface.
		Action: What is this life if,…, Honesty: We Irish are always being accused of looking…, Human Condition: A wonderful fact to reflect…, Human...
		The dust reflects light from the stars to produce a reflection nebula, a fuzzy patch of bluish...
	encarta.msn.com /encnet/refpages/search.aspx?q=Reflection (148 words)

	Focus on Gyulbudaghian's Nebula
		The object as a whole is known as HH 215; the reflection nebula is officially cataloged as GM 1-29 (Magakyan -- the "M" -- was co-author on the discovery paper).
		This reflection nebula appears to be the outer edges of a hollow shell that has been carved out of the interstellar medium surrounding the gas stream.
		In 2001 the nebula was very difficult: it wasn't visible at all at 97x and I was able to detect it at 170x only with great effort and averted vision.
	www.skyhound.com /sh/archive/oct/GM_1-29.html (742 words)

	Iowa Robotic Telescope Facilities
		Nebulae are clouds of dust and gas, and come in nearby stars.
		This nebula is located 1,500 light years away, along our spiral arm in the Milky Way galaxy.
		Next choose a point at the edge of the nebula, and record the x and y coordinates of this point.
	phobos.physics.uiowa.edu /curriculum/orion.html (1111 words)

	Diffuse Nebulae
		Diffuse nebulae were longly be considered as distant, unresolved star clusters or star clouds, until in the 1860s spectroscopy revealed their gaseous nature by showing line spectra, in particular due to the pioneering research of William Huggins.
		Of Messier's nebulae, M78 is the only pure reflection nebula, and the first of these objects to be discovered; its nature as a reflection nebula was revealed in 1919, again by V.M. Slipher.
		Moreover, open star cluster M16 (NGC 6611) is physically connected with the Eagle Nebula IC 4703, an H II region, and the Pleiades, M45, contain diffuse reflection nebulae.
	www.seds.org /messier/diffuse.html (547 words)

	Bright Diffuse Nebulae
		Bright nebulae are usually vast concentrations of gas and dust in which stars have been or are being formed.
		The most famous example is the Crab nebula which is the supernova remnant of a star that exploded in 1054.
		In the middle is M78 - a reflection nebula near the Orion nebula.
	www.atlasoftheuniverse.com /nebulae.html (369 words)

	M78 - Reflection Nebula in Orion
		M78 is a reflection nebula discovered by Pierre Méchain in early 1780.
		Reflection nebulae, such as M78, shine in the reflected and scattered light of bright blue (early B-type) stars.
		This gives the nebula it characteristic blue color and is essentially the same phenomena that produces the blue color of our sky.
	www.waid-observatory.com /m078-2005-12-26.html (125 words)

	NGC1999 Orion Reflection Nebula HST
		Like fog around a street lamp, a reflection nebula shines only because the light from an embedded source illuminates its dust; the nebula does not emit any visible light of its own.
		The nebula is famous in astronomical history because the first Herbig-Haro object was discovered immediately adjacent to it (it lies just outside the new Hubble image).
		In the Hubble image, the globule is seen silhouetted against the reflection nebula illuminated by V380 Orionis.
	www.sonic.net /~ganymede/Astro/Nebulae/Orion/pages/NGC1999Orionhst.htm (453 words)

	Kent Biggs
		An emission nebula is a glowing cloud of interstellar gas.
		The gas is emitting light of its own accord cause by some stimulus such as a nearby star exciting the gas.
		A reflection nebula is a cloud of dust and gas that reflects the light of nearby stars.
	kentbiggs.com /nebula.htm (48 words)

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