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Topic: Trifid Nebula


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In the News (Sat 16 Dec 17)

  
  Turning Star Formation On and Off in the Trifid Nebula
The jet in the Trifid is a ticker tape telling the history of one particular young stellar object that is continuing to grow as its gravity draws in gas from its surroundings.
A stellar jet emerging from the wall of a cloud in the Trifid Nebula.
A tiny jet emerging from the EGG and a patch of reflected light suggest that a young stellar object is buried in the tip of the jet.
eagle.la.asu.edu /hester/trifid.html   (1906 words)

  
  MSN Encarta - Search Results - Trifid Nebula
Trifid Nebula, cloud of interstellar gas and dust in the constellation Sagittarius, at right ascension 18h 02.6m, declination -23° 02′; it is also...
Nebula, a localized mass of the gases and finely divided dust particles that are spread throughout interstellar space.
Crab Nebula, gas cloud that is the remnant of a supernova, or exploding star, in the constellation Taurus.
uk.encarta.msn.com /Trifid_Nebula.html   (108 words)

  
 M20 - Trifid Nebula - Sagittarius
Messier 20, (NGC 6514), the Trifid Nebula, is a bright nebulous region in the western part of Sagittarius, about 1.3 degrees to the north of the Lagoon Nebula.
This can be seen most clearly in the northen part of the nebula where the hydrogen gas has become exhausted and only the dust remains to reflect the light from the hot young stars, most especially the bright magnitude 7.3 star in the centre of the blue reflection region.
In parts of the nebula there is so much dust that it hides the nebula, producing the three dark lanes which caused William Herschel to give the Trifid Nebula its name.
www.astrocruise.com /m20.htm   (504 words)

  
 Trifid Nebula - Wikipedia, the free encyclopedia
The Trifid Nebula (also known as M20 and NGC 6514) is an H II region at right ascension 18
A stellar jet (the thin, wispy object pointing to the upper left) protrudes from the head of the cloud and is about.75 light-years long.
It is pointing from the head of the dense cloud directly toward the star that powers the Trifid nebula.
en.wikipedia.org /wiki/Trifid_Nebula   (315 words)

  
 RedOrbit - Reference Library   (Site not responding. Last check: 2007-08-24)
The dark nebula which is the reason for the Trifid's appearance was cataloged by Barnard as Barnard 85 (B 85).
The red emission nebula with its young star cluster near its center is surrounded by a blue reflection nebula which is particularly conspicuous to the northern end.
In the sky, the Trifid nebula M20 is situated roughly 2 degrees northwest of the larger Lagoon Nebula M8, so that both nebulae form a nice target for wide field photographs, as these images of the M8 and M20 region, or the big DSSM image of this region.
www.redorbit.com /education/reference_library?article_id=73   (406 words)

  
 [No title]   (Site not responding. Last check: 2007-08-24)
The Trifid Nebula is a giant region of star formation located approximately 5,400 light-years away in the constellation Sagittarius.
The Trifid Nebula is unique in that it is dominated by one massive central star that is estimated to be about 300,000 years old (in comparison, our Sun is a star that is about 5,000,000 years old).
The formation of the embryonic stars in the Trifid Nebula is thought to have been triggered by this massive star, which can be seen in the Spitzer image as a white spot at the center of the nebula.
spider.ipac.caltech.edu /staff/lmh/Lithos/trifid.html   (655 words)

  
 NebulaeDrawings   (Site not responding. Last check: 2007-08-24)
Nebulae have been observed for many centuries, either with the naked eye, with ancient and archaic equipment, or with modern quality telescopes.
Other nebulae are virtual stellar nurseries — massive and complex gatherings of dust and gas, in which stars are being born under gradual but tumultuous circumstances.
This fan shaped nebula is associated with R Monocerotis, a massive young star at the nebula's apex.
www.belmontnc.4dw.net /nebulae.htm   (2949 words)

  
 M20 The Trifid Nebula   (Site not responding. Last check: 2007-08-24)
The Trifid Nebula is in the same region of the sky and at about the same distance as the Lagoon Nebula.
The contrast between the emission nebula clouds and the reflection nebula clouds is a beautiful feature of the Trifid Nebula.
It is believed that it was first named the "Trifid Nebula" by John Herschel, the son of the famous astronomer William Herschel, in the mid-1800's.
members.cox.net /sidleach/m20.htm   (251 words)

  
 Astr384 Spring 2004: M20 Trifid Nebula, Elise Crull
The Trifid itself consists only of the reddish southern region; the blue region to the north is an unconnected reflection nebula.
The Trifid is an emission nebula: it is mostly an HII region (which is why we see it as emitting in the red end of the optical spectrum) with some diffuse H-alpha regions along the edges.
The stars behind the reflection nebula appear reddened due to the light scattering effects of the nebula (the nebula itself appears blue for this reason).
www.calvin.edu /academic/phys/observatory/images/Astr384.Spring2004/Crull.html   (614 words)

  
 the @stro pages - @stro objects archive - The Trifid Nebula
The Trifid Nebula became "M20" in Charles Messier's catalog, but it got its "Trifid" name when it was viewed by John Herschel who noticed the appearance of "tri" or three different segments separated by dust lanes.
Emission nebula are nebula that are visible because of radiation from nearby stars exciting the gas in the nebula.
Reflection nebula are nebula that are visible because they are reflecting the light of nearby stars.
theastropages.com /astroobjects/2000/20000313.htm   (274 words)

  
 M20 - The Trifid Nebula   (Site not responding. Last check: 2007-08-24)
The Trifid Nebula (M20), located in the constellation Sagittarius, is so named because of its three dark rifts.
The bright multiple star system in the center of the Trifid is HN 40 and is possibly the source of illumination of the nebula.
This nebula is estimated to be 2000 light years distant.
www.astroimages.org /astrophotos/m20-18-5.html   (156 words)

  
 Trifid Nebula
The Trifid Nebula is a cluster with nebula which is located in the constellation Sagittarius.
The Trifid Nebula is located at 18 02.6 right ascension and -23 02 declination.
This Cluster with Nebula has an apparent angular size of 28 and a visual brightness of 9.
www.absoluteastronomy.com /nebulas/trifid.htm   (73 words)

  
 Universe Today - New Details at the Heart of the Trifid Nebula   (Site not responding. Last check: 2007-08-24)
Many astronomers studying nebulae like the Trifid are focusing their research on the ways that waves of star formation move through such regions.
The group of bright O-type stars at the center of the Trifid illuminates a dense pillar of gas and dust, seen to the right of the center of the image, producing a bright rim on the side facing the stars.
The Hubble image of the Trifid Nebula has given astronomers insight into the nature of the interaction of gaseous, dusty and stellar material in an area where dust, gas clouds, and new and old stars coexist.
universetoday.com /am/publish/new_details_heart_trifid_nebula.html?...   (829 words)

  
 Emission Nebulae
An equilibrium is established in a typical emission nebula when the temperature equivalent of this kinetic motion is between 7000 K and 20,000 K. For a typical emission nebulae, the density of ions (and electrons) is 1.0E8 to 1.0E10 particles per m^3.
Some of the most famous and beautiful of the emission nebulae visible from the Northern Hemisphere are the Orion Nebula (M42, the Messier catalog number), the Lagoon Nebula (M8), and the Trifid Nebula (M20).
The Trifid Nebula in Sagittarius is characterized by dust lanes that divide it into three distinct parts.
fusedweb.pppl.gov /CPEP/Chart_Pages/5.Plasmas/Nebula/Emission.html   (459 words)

  
 M8 and M20   (Site not responding. Last check: 2007-08-24)
The Lagoon Nebula is the large red nebula in the left center.
The nebula can be seen with the naked eye on a clear night under dark skies as a fuzzy grey patch near the main band of the Milky Way in Sagittarius.
The Trifid Nebula is the smaller red and blue nebula on the right.
members.cox.net /~sidleach/m8_m20.htm   (433 words)

  
 ESA Science & Technology: 'Chained' star-formation in the Trifid nebula
The bright massive central star in the spectacular Trifid nebula is creating a second generation of young stars, in a 'chain reaction' process that is taking place in less than a hundred thousand years.
Stars form in nebulae by gravitational collapse of the dust and gas, and that is how the massive central star illuminating the Trifid nebula was born a hundred thousand years ago.
But the energy that this star has been emitting during all this time has changed the physical and chemical conditions of its environment, accelerating the occurrence of another gravitational collapse which, as ISO sees now, is causing the secondary generation of stars to be born simultaneously in a short period of time.
sci.esa.int /science-e/www/object/index.cfm?fobjectid=12764   (504 words)

  
 APOD_04   (Site not responding. Last check: 2007-08-24)
While reading about the beautiful Trifid Nebula (aka M20), I didnt know what really it was about until I clicked on the Trifid Nebula, it describes it as one of the looked at summer nebula.
The word Trifid was used by John Herschel to describe the nebula.
The Trifid contains three colors, and one of its shades are red the emission nebulae,which is dominated by light caused by the hydrogen atoms, reading more about it I find out that the stars of clusters lies in Rosette Nebula.
www.k12.hi.us /~jdela224/apod/apod04.html   (300 words)

  
 M20 - Trifid Nebula
The Trifid Nebula M20 is a rare combination of an emission and reflection nebula.
In the northern part of the Trifid, in contrast, the stars are not hot enough to excite the gas; the blue glow is the result of starlight being reflected by a myriad of dust particles.
The Trifid Nebula is small and does have relatively high surface brightness, therefore the use of filters is not compulsory; to the contrary, the diffuse reflection nebula which forms the northern part of M20 will simply disappear if you use any nebula filter.
astro.nightsky.at /Photo/Neb/M8_M20_WN_detail2.html   (622 words)

  
 Multiwavelength Messier 20 - Trifid Nebula
Messier 20 is an emission nebula and the reddish color is produced by the characteristic light of (fluorescent) hydrogen gas.
A bright star cluster lies at the center of the emission nebula, and is partially obscured by lanes of thick dust.
The blue reflection nebula to the north is unconnected with M20 and just happens to appear in the same field of view.
coolcosmos.ipac.caltech.edu /cosmic_classroom/multiwavelength_astronomy/multiwavelength_museum/m20.html   (574 words)

  
 CNN - Hubble sees stellar birth, destruction in Trifid Nebula - Nobember 9, 1999
The cloud of new starbirth is about 8 light-years away from the nebula's central star, which is beyond the top of the picture.
The thin, wispy object pointing to the upper left of the image is a stellar jet, which extends three-quarters of a light-year into the nebula.
Radiation from the massive star at the center of the nebula causes the gas in the jet -- and the rest of the nebula -- to glow.
www.cnn.com /TECH/space/9911/09/trifid.nebula/index.html   (347 words)

  
 APOD: 2005 May 26 - A Beautiful Trifid   (Site not responding. Last check: 2007-08-24)
Explanation: The beautiful Trifid Nebula (aka M20), a photogenic study in cosmic contrasts, lies about 5,000 light-years away toward the nebula rich constellation Sagittarius.
A star forming region in the plane of our galaxy, the Trifid fittingly illustrates three basic types of astronomical nebulae; red emission nebulae dominated by light from hydrogen atoms, blue reflection nebulae produced by dust reflecting starlight, and dark absorption nebulae where dense dust clouds appear in silhouette.
In this gorgeous wide view, the red emission region is also surrounded by the telltale blue haze of reflection nebulae.
www.star.ucl.ac.uk /~idh/apod/ap050526.html   (181 words)

  
 USATODAY.com - Hubble once again casts its eyes upon Trifid Nebula   (Site not responding. Last check: 2007-08-24)
Astronomers study it to learn how stars form by noting the various stages of the process, from embryos to newborns, from infants destined to grow up like the Sun and young giants that won't see the equivalent of their teens because they're too massive to live out a normal life span.
In the new view, the center of the nebula is seen with fresh precision.
Atop the pillar, wispy filaments of glowing oxygen evaporate into space.The Trifid Nebula is also known as M20 and NGC 6514.
www.usatoday.com /news/science/2004-06-04-hubble-trifid_x.htm   (524 words)

  
 Star Birth in the Trifid Nebula
This NASA Hubble Space Telescope (Wide Field/Planetary Camera 2 (WFPC2)) image of the Trifid Nebula (M20) reveals a stellar nursery being torn apart by radiation from a nearby, massive star.
The picture also provides a peek at embryonic stars that are forming within an ill-fated cloud of dust and gas, which is destined to be eaten away by the glare from the massive neighbor.
Reflected starlight at the tip of the EGG may be due to light from the Trifid's central star or from a young stellar object buried within the EGG.
www.amsky.com /astronomy/deepsky/star_birth_trifid/trifid.html   (656 words)

  
 SPACE.com -- Hubble Images Show Birth and Death in Stellar Nursery
The story begins with this ground-based image of the Trifid Nebula, a broad bubble of gas and dust some 9,000 light-years from Earth.
Near the center of this nearly circular nebula, and partially hidden by a dark band of dust, is a large star, many times more massive than our sun.
"The jet in the Trifid is a ticker tape telling the history of one particular young stellar object that is continuing to grow as its gravity draws in gas from its surroundings," Hester said.
www.space.com /scienceastronomy/astronomy/trifid_991109.html   (1057 words)

  
 Trifid Nebula
Similar to the nearby Omega nebula, the Trifid nebula is a large hydrogren cloud containing areas of active star formation.
The three dark lanes in the Trifid are probably dark foreground clouds.
With a telescope, the three dark lanes become visible, though the blue reflection nebula is much tougher to see visually.
tjm.home.texas.net /trifid.html   (112 words)

  
 Messier Object 20
The dark nebula which is the reason for the Trifid's appearance was cataloged by Barnard as Barnard 85 (B 85).
The red emission nebula with its young star cluster near its center is surrounded by a blue reflection nebula which is particularly conspicuous to the northern end.
In the sky, the Trifid nebula M20 is situated roughly 2 degrees northwest of the larger Lagoon Nebula M8, so that both nebulae form a nice target for wide field photographs, as these images of the M8 and M20 region, or the big DSSM image of this region.
www.seds.org /messier/m/m020.html   (526 words)

  
 ISOCAM Image Of The Trifid Nebula
The Trifid Nebula in the constellation Sagittarius changes its appearance dramatically when seen by infrared light by ESA's Infrared Space Observatory ISO.
The bright, pink-glowing nebula (right) was imaged by the IAC80 telescope of the Instituto de Astrofisica de Canarias, Tenerife, Spain.
The bright nebula was discovered about 250 years ago by the French astronomer Legentil de La Galaisière, and soon won a place as M20 in Charles Messier's catalogue of nebulous objects.
www.ipac.caltech.edu /Outreach/Gallery/ISO/cam/trifid.html   (381 words)

  
 APOD: 2004 June 18 - The Trifid Nebula from Hubble   (Site not responding. Last check: 2007-08-24)
Trifid Nebula, a star forming region toward the
Mountains of opaque dust appear on the right, while filaments of dust are visible threaded throughout the nebula.
The Trifid, also known as M20, is only about 300,000 years old, making it among the youngest emission nebula known.
www.star.ucl.ac.uk /~idh/apod/ap040618.html   (149 words)

  
 Astronomy CD ROM I - Star Birth in the Trifid Nebula   (Site not responding. Last check: 2007-08-24)
This NASA Hubble Space Telescope image of small dense cloud in the Trifid Nebula in the constellation Sagittarius, 9,000 light-years from the Earth, reveals a stellar nursery being torn apart by radiation from a nearby, massive star.
It also provides a peek at embryonic stars that are forming within a cloud of dust and gas, which is destined to be eaten away by the radiation from the massive neighbor.
The jet tells the history of one particular young stellar object that is continuing to grow as its gravity draws in gas from its surroundings.
astroa.physics.metu.edu.tr /Astronom/ON/S9942.HTM   (397 words)

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