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	Helix Nebula - Wikipedia, the free encyclopedia
		The Helix Nebula (also known as NGC 7293) is a planetary nebula about 650 light-years away in the constellation Aquarius.
		The Helix Nebula is an example of a planetary nebula created at the end of the life of a Sun-like star.
		Recent pictures of Helix are a composite of newly released images from the ACS instrument on the Hubble Space Telescope and wide-angle images from the Mosaic Camera on the WIYN 0.9-m Telescope at Kitt Peak National Observatory.
	en.wikipedia.org /wiki/Helix_Nebula (267 words)

	Helix Nebula: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-11-04)
		A planetary nebula is an astronomical astronomical objectobject consisting of a glowing shell of gas formed by certain types of stars at the end of their...
		The red spider nebula (also known as planetary nebula ngc 6537 or ngc 6537) is a planetary nebula in the sagittarius constellation....
		The planetary nebula ngc 2346 (also known as butterfly ngc 2346 or ngc 2346) is a planetary nebula on the celestial equator in the monoceros conste...
	www.absoluteastronomy.com /encyclopedia/h/he/helix_nebula.htm (1158 words)

	Astr111, Fall 2004: Helix Nebula, Sharon Abraham
		A nebula is a cloud of interstellar gas or dust ejected by a giant star late in its life.
		The outer rings of the nebula are predominantly red indicating that it is comprised of hydrogen atoms.
		The distance between the star and the helix is large is evidence that it a relatively old nebula.
	www.calvin.edu /academic/phys/observatory/images/Astr111.Fall2004/Abraham.html (414 words)

	Exploring News & Features - A new twist on an old nebula
		The latest example of this reconstructive artistry is a new model of the Helix Nebula—one of the nearest and brightest of the planetary nebulae, which are the Technicolor clouds of dust and glowing gas produced by stellar explosions.
		Instead of being structured like a helix, they have found that the nebula consists of inner and outer shells of dust and gas that are oriented at nearly 90 degrees from one another.
		The nebula's inner disk is expanding slightly faster than the outer disk leading the astronomers to estimate that the inner disk was formed about 6,600 years ago while the outer ring is about 12,000 years ago.
	exploration.vanderbilt.edu /news/news_helix_nebula.htm (995 words)

	Discovery Channel :: News :: Hubble Clarifies Helix Nebula (Site not responding. Last check: 2007-11-04)
		Studying the Helix Nebula, the closest nebula to Earth, can give astronomers insights into how expelled shells of gas from dying stars like our sun form the often complex shapes called planetary nebulas, according to a press release from NASA.
		Earlier images of the Helix Nebula were not exact enough to allow scientists to work out its structure.
		The study of the nebula was published in the November issue of the Astronomical Journal.
	dsc.discovery.com /news/briefs/20041213/hubble.html (415 words)

	NGC7293 Helix Nebula (Site not responding. Last check: 2007-11-04)
		: The Helix Nebula, a planetary nebula in the Constellation Aquarius, has the largest angular diameter of any planetary, nearly half a degree, and at 458 light-years, is the closest to our sun.
		While exploring the Helix with the HST, astronomers discovered thousands of "cometary knots" of gas and dust with "heads" billions of miles across and tails pointing away from the star which shed the material making up these cosmic wonders.
		Apparently, fast moving shells of nebular gas overunning cooler, denser, slower shells ejected by the star during earlier expansion of its outer atmospheres, formed the comet or droplet-shaped condensations.
	www.ironmountainobservatory.com /photos/singles/helix_nebula.html (125 words)

	NGC 7293 - The Helix Nebula
		For the Helix, the 6.5 magnitude point source is spread out into an area almost half the size of the full moon, resulting in extremely low surface brightness.
		The Helix is a planetary nebula, estimated to be about 500 light years distant.
		The nebula is the outer atmosphere of a dying star, ejected into space as the star runs out of nuclear fuel and collapses into a white dwarf.
	tjm.home.texas.net /helix.html (165 words)

	Helix Nebula - NASA (Site not responding. Last check: 2007-11-04)
		This photograph of the coil-shaped Helix Nebula is one of the largest and most detailed celestial images ever made.
		At 650 light-years away, the Helix is one of the nearest planetary nebulae to Earth.
		A planetary nebula is the glowing gas around a dying, Sun-like star.
	www.parstimes.com /spaceimages/helix_nebula.html (70 words)

	News from Vanderbilt University
		The latest example of this reconstructive artistry is a new model of the Helix Nebula — one of the nearest and brightest of the planetary nebulae, which are the Technicolor clouds of dust and glowing gas produced by exploding stars.
		Space-based x-ray observations suggest that the Helix Nebula was produced by a binary star system with the two stars so close that they appear as a single image in optical telescopes.
		The nebula’s inner disk is expanding slightly faster than the outer disk, leading the astronomers to estimate that the inner disk was formed about 6,600 years ago while the outer ring is about 12,000 years old.
	sitemason.vanderbilt.edu /newspub/bjfTyg?id=16249 (916 words)

	Helix Nebula
		This picture of the coil-shaped Helix Nebula is one of the largest and most detailed celestial images ever made.
		Fortunately, the Helix Nebula was almost exactly in the opposite direction of the meteor stream, so Hubble used nine orbits to photograph the nebula while it waited out the storm.
		The Helix Nebula is a popular target of amateur astronomers and can be seen with binoculars as a ghostly, greenish cloud in the constellation Aquarius.
	www.pastcf.org /helix.html (445 words)

	nebula
		At a distance of 450 light years, it is the closest planetary nebula to earth.
		These types of objects were termed "planetary nebula" over 200 years ago because they resembled dim planets through the telescopes of that time.
		The nebula is composed of a huge cloud of mostly hydrogen gas measuring 10 light-years across, more than twice the distance of the earth to the nearest star.
	www.stardoctor.org /nebula.html (334 words)

	The Helix Nebula
		The Helix Nebula (NGC7293) in Aquarius is the closest of the class of planetary nebulae.
		The nebula's distance is estimated to be only about 450 light years.
		As with all planetary nebulae, it is formed by the ejection of material from the hot central star.
	www.astroimages.org /astrophotos/hx18-21.html (106 words)

	Press Release: Spitzer Puts a New Spin on the Helix Nebula
		It is one of the closest planetary nebulas -- a type of nebula formed from gas ejected by a dying sunlike star.
		A new portrait of the Helix Nebula, created by the penetrating infrared gaze of NASA's Spitzer Space Telescope, is being released today at the 207th meeting of the American Astronomical Society.
		The most striking feature of the Helix, first revealed by ground-based images, is its collection of thousands of distinct blobs that resemble comets due to their compact heads and long, streaming tails.
	www.spitzer.caltech.edu /Media/releases/ssc2006-01/release.shtml (596 words)

	Universe Today - What is the Shape of the Helix Nebula?
		The Helix, the closest planetary nebula to Earth, is a favorite target of professional and amateur astronomers.
		The Helix is so large that the team needed both telescopes to capture a complete view.
		Hubble observed the Helix's central region; the Cerro Tololo telescope, with its wider field of view, observed the outer region.
	www.universetoday.com /am/publish/new_ideas_helix_nebula.html?16122004 (996 words)

	Cosmic Voyage-The Online Resource for Amateur Astronomers (Site not responding. Last check: 2007-11-04)
		NGC 7293 is a stunning planetary nebula in northern Aquarius.
		The common name for this nebula, the Helix, arises from similarity in appearance to a double helix.
		NGC 7293 is so bright in my 10-inch, that the double helix or overlapping circular structure is difficult to deduce.
	members.aol.com /billferris/n7293.html (187 words)

	HubbleSite - Iridescent Glory of Nearby Helix Nebula - Image - 5/9/2003 (Site not responding. Last check: 2007-11-04)
		Because the nebula is nearby, it appears as nearly one-half the diameter of the full Moon.
		Planetary nebulae like the Helix are sculpted late in a Sun-like star's life by a torrential gush of gases escaping from the dying star.
		Based on the nebula's distance of 650 light-years, its angular size corresponds to a huge ring with a diameter of nearly 3 light-years.
	hubblesite.org /newscenter/newsdesk/archive/releases/2003/11/image/a (719 words)

	ESA Science & Technology: Helix Nebula in Infrared
		Astronomers are surprised by new observations of the Helix Nebula, by ESA's Infrared Space Observatory, ISO.
		Cox and his colleagues believe that during the lifetime of the nebula (a few thousand years) the grains have been destroyed by powerful ultraviolet rays emitted by the very hot white dwarf at the center of the nebula.
		The Helix Nebula (alias NGC 7293) is the closest example, at a distance of 500 light-years.
	sci.esa.int /science-e/www/object/index.cfm?fobjectid=32720 (419 words)

	NGC 7293, The Helix Nebula
		The Helix nebula is the largest planetary nebula in the sky subtending an angle the size of half the full moon, and can easily be seen even in small binoculars despite it's low surface brightness if observed under a dark and transparent sky.
		Sometimes called the "Sunflower" nebula, it is a shell of expanding gas blown off by the magnitude 13.3 star at it's center, which is extremely hot.
		This photo also shows a portion of the extremely faint outer loop of the Helix nebula, visible to the upper left of the main, bright portion of the nebula.
	www.astropix.com /HTML/E_SUM_N/NGC7293.HTM (193 words)

	SPACE.com -- Cosmic 'DNA': Double Helix Spotted in Space
		The Double Helix Nebula is the reddish inset; the larger-field greenish image is a shorter-wavelength infrared image made recently with the IRAC camera on the Spitzer Space Telescope.
		The double helix shape is commonly seen inside living organisms, but this is the first time it has been observed in the cosmos.
		The nebula is nearly perpendicular to the fl hole, moving out of the galaxy at a quick clip—about 620 miles per second (1,000 kilometers per second).
	www.space.com /scienceastronomy/060315_dna_nebula.html (650 words)

	NYU Physicist Helps Produce 3-D "Globe" Of Helix Nebula
		The nebula is shown as a statue-like structure illuminated from the rear, so the darker areas are nearer.
		The astonomers' 3-D image of the nebula -- which is based on data from the Caltech Sub-Millimeter Observatory -- allows the team to inspect it from all sides: front, back, sides, top and bottom.
		For each blob of gas ejected on one side of the nebula, there is a similar structure being ejected on the opposite side.
	www.eurekalert.org /pub_releases/1999-01/NYU-NPHP-060199.php (396 words)

	The Helix Nebula (Site not responding. Last check: 2007-11-04)
		The nebula has a low surface brightness and is difficult to see unless you have dark skies.
		The gasses forming the nebula glow (similar to a fluorescent light) as a result of ultraviolet radiation from the central star.
		The gas forming the nebula is thrown off by a star during the latter stages of stellar evolution.
	members.cox.net /sidleach/helix.htm (162 words)

	NGC 7293, the Helix Nebula
		Planetary Nebula NGC 7293 (= Bennett 129) in Aquarius
		The Helix Nebula is one of the closest of all planetary nebulae: Lying at a distance of perhaps 450 light years, it is the only planetary nebula for which a parallax could be obtained by ground-based observations.
		Although the nebula is quite bright, its light is spread over this large area so that it is not an easy object for visual observing; the Herschels have apparently never cataloged or observed it.
	www.seds.org /messier/xtra/ngc/n7293.html (246 words)

	Scientists discover double-helix nebula (Site not responding. Last check: 2007-11-04)
		UCLA scientists have stumbled upon a never-before-seen phenomenon: a double-helix-shaped nebula reminiscent of the structure of a DNA molecule, the genetic material of living organisms.
		The double-helix nebula is approximately 300 light-years from the enormous fl hole at the center of the Milky Way, and the part of the nebula the astronomers observed stretches 80 light-years in length.
		Morris and his colleagues said the estimated 100,000-year-old helix filaments may be caused by a huge disk of gas, known as the circumnuclear disk, which orbits just a few light-years outside the fl hole at the center of the galaxy.
	www.dailybruin.ucla.edu /news/articles.asp?id=36980 (466 words)

	The Helix Nebula in Aquarius
		NGC 7293 - THE HELIX NEBULA in AQUARIUS
		The largest planetary nebula in the night sky, the Helix Nebula, is some 10 times larger than the famous Ring Nebula (M57).
		While the Helix is no doubt of similar size to the Ring, it is much closer to Earth, perhaps some 450 light years away.
	www.allaboutastro.com /ngc7293.html (399 words)

	NGC 7293 - Helix Nebula (Site not responding. Last check: 2007-11-04)
		NGC 7293, the Helix, or Helical Nebula, is the largest planetary nebula in the sky.
		The nebula is quite close - only at a distance of about 540 light years, this is an average distance based on many widely discrepant figures.
		The Helix is named because its ring shape resembles a helical coil.
	astro.nightsky.at /Photo/PN/Helix_APO.html (240 words)

	IC 418: The Spirograph Nebula (Info).
		Dubbed the Spirograph Nebula for its resemblance to drawings from a cyclical drawing tool, planetary nebula IC 418 shows patterns that are not well understood.
		The Helix Nebula, given a technical designation of NGC 7293, lies 450 light-years away towards the constellation of Aquarius and spans 1.5 light-years.
		A majestic view of a planetary nebula NGC 2392, first spied by William Herschel in 1787 (nickname the ‘Eskimo’ Nebula).
	hera.ph1.uni-koeln.de /~heintzma/PN/PN2.htm (2089 words)

	Twisted double-helix nebula found in Milky Way - Boston.com
		Cosmic nebulae usually look like blobs in space, but astronomers using the Spitzer Space Telescope reported on Wednesday they have found a nebula twisted like the double helix of DNA.
		The discovery of the twisted nebula, which stretches across 80 light-years at the center of the Milky Way, the galaxy that includes Earth, was reported in the current edition of the journal Nature.
		The strands of the nebula may be torqued by twisted magnetic fields at the Milky Way's center, Morris said by telephone.
	www.boston.com /news/science/articles/2006/03/15/twisted_double_helix_nebula_found_in_milky_way?mode=PF (354 words)

	NGC 7293 (Helix Nebula) - Planetary Nebula in Aquarius
		NGC 7293 (Helix Nebula) - Planetary Nebula in Aquarius
		The Helix Nebula is one of the closest of all planetary nebulae, lying at a distance of about 400 light years from Earth.
		If observed from a dark location the Helix is visible even with binoculars, that show the object as a large circular hazy spot.
	www.nightskyinfo.com /archive/helix_planetary_nebula (211 words)

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