The figure of this nebula is nearly that of a Greek capital omega, Ω, somewhat distorted, and very unequally bright. Messier 17 is a star forming region with an open cluster, and it is part of a larger cloud of molecular gas found in the direction of Sagittarius. The stars in the Omega Nebula do not readily appear in optical images, but are hidden within the nebula. M17 contains a large amount of dark obscuring material, which is also heated by the hot young stars, and can be seen in infrared wavelengths. North is down and East is to the right in the image. Apparent magnitude: 6.0 Although it is small in this image, the disc has a diameter of about 20 000 AU, dwarfing our Solar System (1 AU is the distance between the Earth and the Sun). The image shows a central region about 15 light-years across, although the entire nebula is even larger, about 40 light-years in total. It has an estimated age of just 1 million years. Image: ESO, This image of the Omega Nebula (Messier 17), captured by ESO’s Very Large Telescope (VLT), is one of the sharpest of this object ever taken from the ground. The Omega Nebula, also known as Messier 17 (M17), is a bright emission nebula located in Sagittarius constellation. The small open cluster Messier 18 is a degree to the north and Messier 17 lies another degree to the north. Originally an independent asari colony named Esan, it was annexed by the Batarian Hegemony in 1913, causing a minor galactic incident. It has a geometry similar to the famous Orion Nebula (Messier 42), but unlike M42, which appears face-on when observed from Earth, the Omega Nebula appears edge-on. According to Kharchenko et al. The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter and has a mass of 30,000 solar masses. It is located roughly 10 degrees north of the Teapot asterism, and roughly at the same distance from two other famous nebulae in Sagittarius, the Lagoon Nebula (Messier 8) and the Trifid Nebula (Messier 20). The Omega Nebula is a blue, red and purple nebula located in the constellation Sagittarius at a distance of app. It spans an angle equal to about one third the diameter of the Full Moon, corresponding to about 15 light-years at the distance of the Omega Nebula. Located at a distance of 17,090 light-years (5,240 pc), it is the largest globular cluster in the Milky Way at a diameter of roughly 150 light-years. The Omega Nebula lies at a distance between 5,000 and 6,000 light years from Earth, a bit closer to us than M17’s larger neighbour, the Eagle Nebula (Messier 16). The Omega Nebula would be magnitude 2.5 at the same distance. It is an H II region and a double radio source. Red represents sulfur; green, hydrogen; and blue, oxygen. (2005), the distance of M17 is 5910 light years and its diameter is 10 light years. [3] Its local geometry is similar to the Orion Nebula except that it is viewed edge-on rather than face-on. A large silhouette disc has been found to the south-west of the cluster centre. The Omega Nebula, also known as Messier 17 (M17), is a bright emission nebula located in Sagittarius constellation. Image: ESO. Credit: The Omega Nebula can also be found by first identifying Gamma Scuti, a magnitude 4.70 star in Scutum constellation. Sketches were also made by William Lassell in 1862 using his four-foot telescope at Malta, and by M. Trouvelot from Cambridge, Massachusetts and Edward Singleton Holden in 1875 using the twenty-six inch Clark refractor at the United States Naval Observatory. Constellation: Sagittarius Image: ESO, Astronomers using data from ESO’s Very Large Telescope (VLT), at the Paranal Observatory in Chile, have made an impressive composite of the nebula Messier 17, also known as the Omega Nebula or the Swan Nebula. The Eagle nebula is ionized by the NGC 6611 star cluster, which is part of the Serpens OB1 association. The Omega Nebula, sometimes called the Swan Nebula, is a dazzling stellar nursery located about 5500 light-years away towards the constellation of Sagittarius (the Archer). The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter and has a mass of 30,000 solar masses. Like its famous cousin in Orion, the Swan Nebula is illuminated by ultraviolet radiation from young, massive stars, located just beyond the upper right corner of the image. Omega Nebula: has discoverery date 1745: is a part of Sagittarius: has Messier number 17: has synonym Swan Nebula: has synonym M 17: has synonym NGC 6618: has discoverer Philippe Loys de Cheseaux: has image: has definition A bright H II region. Coordinates: 18h 20m 26s (right ascension), -16°10’36” (declination) Hidden in this region, which has a dark reddish appearance, the astronomers found the opaque silhouette of a disc of gas and dust. He described the figure of the nebula as “nearly that of a Greek capital omega, Ω, somewhat distorted, and very unequally bright.”. ... Messier perceived only the bright eastern branch of the nebula now in question, without any of the attached convolutions which were first noticed by my father. Omega Centauri (ω Cen, NGC 5139, or Caldwell 80) is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677. Image: NASA, Holland Ford (JHU), the ACS Science Team and ESA. M17, also known as the Omega Nebula or Swan Nebula, is one of the largest star-forming regions in the Milky Way galaxy. The diffuse emission nebula lies near the constellation’s northern border with Scutum, at a distance of 5,000 to 6,000 light years from Earth. The three filters used are B (blue), V (“visual”, or green) and R (red). Their ultraviolet radiation erodes the dense cloud in which they were formed. 5.500 LY from Sol. Technical information : The exposures were made through three filtres, J (at wavelength 1.25 µm; exposure time 5 min; here rendered as blue), H (1.65 µm; 5 min; green) and Ks (2.2 µm; 5 min; red); an additional 15 min was spent on separate sky frames. The chief peculiarities which I have observed in it are — 1. The nebula has the designation NGC 6618 in the New General Catalogue. It is also the birthplace of many stars and it contains, in its core, an open cluster (NGC 6618) with about 800 stars in it. The objects in the uppermost left corner area appear somewhat elongated because of a colour-dependent aberration introduced at the edge by the large-field optics. It is thought that this disc is rotating and feeding material onto a central protostar — an early stage in the formation of a new star. Discovered by Philippe Loys de Chéseaux in 1745-46. The wave-like patterns of gas have been sculpted and illuminated by a torrent of ultraviolet radiation from young, massive stars, which lie outside the picture to the upper left. When Herschel published his 1837 sketch in 1847, he wrote:[2]. This image shows the center of the Swan Nebula, or M 17, a hotbed of newly born stars wrapped in colorful blankets of glowing gas and cradled in an enormous cold, dark hydrogen cloud. The Omega nebula (M17) is about 4250 light years away and it … There are also more than a thousand stars being formed in the nebula’s outer regions. The luminous blue variable HD 168607, located in the south-east part of the Omega nebula, is generally assumed to be associated with it; its close neighbor, the blue hypergiant HD 168625, may be too. These deep VLT observations were made at near-infrared wavelengths with the ISAAC instrument. The Standard Dictionary gives it thus, but mentions the components as omega (ω), or a 1, b and e. In classical antiquity, Capricorn was the location of the Sun at the winter solstice, but due to the precession of the equinoxes, this had shifted to Sagittarius by the time of the Roman Empire. Image: ESO, Three-colour composite image of the Omega Nebula (Messier 17, or NGC 6618), based on images obtained with the EMMI instrument on the ESO 3.58-metre New Technology Telescope at the La Silla Observatory. It is a popular target for amateur astronomers, who can obtain good quality images using small telescopes. In particular the large horseshoe-shaped arc … is there represented as too much elongated in a vertical direction and as bearing altogether too large a proportion to [the eastern] streak and to the total magnitude of the object. Distance: 5500 ly; Type: emission nebula; aka the Swan Nebula, the Horseshoe Nebula, the Checkmark Nebula, the Lobster Nebula; The Omega Nebula is brighter than its neighbor the Eagle Nebula and consists almost entirely of gas with few stars (as yet). M17 is one of the brightest, most massive star-forming regions in our galaxy. It is also known as the Swan Nebula, Horseshoe Nebula, Lobster Nebula, or Checkmark Nebula. The Omega Nebula is a star factory sculpted by stellar winds and radiation. About a hundred of them belong to a spectral class earlier than B9, while nine of them are type O stars. Others who have sketched the nebula include William Lassell in 1862, who used a 4-foot telescope at Malta and Edward Singleton Holden in 1875, using the 26-inch Clark refractor at the U.S. Its glowing hydrogen gas is due to excitation from ultraviolet radiation emitted by hot young stars embedded in the nebula. M17 contains far more newly formed stars than the Orion Nebula. At visible wavelengths, dust grains in the cloud obscure our view, but by observing in infrared light, the glow of the hydrogen gas behind the cloud can be seen shining faintly through. Centre de données astronomiques de Strasbourg, Omega Nebula (Messier 17) at Constellation Guide, Catalogue of Nebulae and Clusters of Stars, https://en.wikipedia.org/w/index.php?title=Omega_Nebula&oldid=995329474, Articles with unsourced statements from December 2015, Creative Commons Attribution-ShareAlike License, This page was last edited on 20 December 2020, at 13:04. Located between 5,000 and 6,000 light years from Earth is the Omega Nebula, one of the brightest and most massive star-forming regions in our galaxy The nebulous diffusion, too, at the [western] end of that arc, forming the [western] angle and base-line of the capital Greek omega (Ω), to which the general figure of the nebula has been likened, is now so little conspicuous as to induce a suspicion that some real change may have taken place in the relative brightness of this portion compared with the rest of the nebula; seeing that a figure of it made on June 25, 1837, expresses no such diffusion, but represents the arc as breaking off before it even attains fully to the group of small stars at the [western] angle of the Omega. A second, more detailed sketch was made during his visit to South Africa in 1837. The Omega Nebula, a stellar nursery where infant stars illuminate and sculpt a vast pastel fantasy of dust and gas, is revealed in all its glory by a new image released by the ESO. Neither Mr. Mason, however, nor any other observer, appears to have had the least suspicion of the existence of the fainter horseshoe arc attached to the [eastern] extremity of Messier's streak. Located about … The Omega Nebula is a region of active star formation. The open cluster within the nebulosity is one of the youngest open clusters known. Omega Nebula – Messier 17 The dark areas are due to obscuration of the light from background objects by large amounts of dust – this effect also causes many of those stars to appear quite red. +6.0: RA (J2000) 18h 20m 47s: DEC (J2000)-16d 10m 18s: Apparent Size (arc mins) 20 x 15: Radius (light-years) 16: Other Names: Collinder 377 Location: Milky Way /Omega Nebula /Fathar System / First planet Lorek is an extremely rare example of a habitable world circling a red dwarf star. To the lower right of the cluster is a huge cloud of molecular gas. The intense heat and pressure cause some material to stream away from those surfaces, creating the glowing veil of even hotter greenish gas that masks background structures. NASA's Spitzer Space Telescope has captured a new, infrared view of the choppy star-making cloud called M17, also known as the Omega Nebula or the Swan Nebula. The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter and has a mass of 30,000 solar masses. The Swan portion of M17, the Omega Nebula in the Sagittarius nebulosity is said to resemble a barber's pole. Image: ESO/R. A detail of the Eagle nebula, often called "The Pillars of Creation", became one of the Hubble Space Telescope's most famous images. Messier 17 (M17), also known as the Omega Nebula, is a famous star-forming nebula located in the southern constellation Sagittarius. The Omega Nebula. Bluer objects are either foreground stars or well-developed massive stars whose intense light ionizes the hydrogen in this region. The diffuse light that is visible nearly everywhere in the photo is due to emission from hydrogen atoms that have (re-)combined from protons and electrons. Naval Observatory. The first released VST image shows the spectacular star-forming region Messier 17, also known as the Omega Nebula or the Swan Nebula, as it has never been seen before. It is a low-density cloud of partially ionized gas which spans some 15 light-years in diameter and has a mass of an estimated 800 solar masses. V4029 Sag appears red because of dust and gas. Mr. Mason ... expressly states that both the nebulous knots were well seen by himself and his coadjutor Mr. Smith on August 1, 1839, i.e., two years subsequent to the date of my last drawing. [2], Omega Nebula (left), Eagle Nebula (center), and Sharpless 2-54 (right).[8]. The VST field of view is so large that the entire nebula, including its fainter outer parts, is captured — and retains its superb sharpness across the entire image. After discovering the nebula, de Chéseaux noted, “It is of a completely different shape than the others: It has perfectly the form of a ray, or of the tail of a comet, of 7′ length and 2′ broadth; its sides are exactly parallel and rather well terminated, as are its two ends.”, The nebula was catalogued by Charles Messier, who discovered it independently, on June 3, 1764. It has an apparent magnitude of 6.0. The total mass of the Omega Nebula is an estimated 800 solar masses. The resolvable knot in the eastern portion of the bright branch, which is, in a considerable degree, insulated from the surrounding nebula; strongly suggesting the idea of an absorption of the nebulous matter; and, 2. The Omega Nebula contains up to 800 stars in total. Dr. Lamont has given a figure of this nebula, accompanied by a description. Messier 17 can be seen without binoculars in good viewing conditions from locations that aren’t too far north. Distance: 5,000 to 6,000 light years Position: 18h 20m 25.99s Messier 17 is in the constellation of Sagittarius (the Archer), about 6000 light-years from Earth. Image: NASA, ESA and J. Hester (ASU). The Omega Nebula, M17 with Outline of ACS Image (ground-based image). Distance: 5,000-6,000 ly https://en.wikipedia.org/wiki/Omega_Nebula Exposures: 8 @ 300s using the Optolong L-eNhance filter. Acknowledgement: OmegaCen/Astro-WISE/Kapteyn Institute. The Omega Nebula’s reddish colour is the result of hot hydrogen gas being illuminated by newly formed stars in the nebula. At that distance, this 1/3 degree wide field of view spans over 30 light-years. Despite several attempts, the local Terminus warlords have never been able to take Lorek for themselves. Angular size: 20′ x 15′ The Omega Nebula is a blue, red and purple nebula located in the constellation Sagittarius at a distance of app. M17 can easily be found in binoculars by starting from Lambda Sagittarii, the star marking the lid of the Teapot, and moving north, past the Sagittarius Star Cloud (Messier 24). In this figure [our Fig. It has a diameter spanning about 15 light years. The Omega Nebula is between 5,000 and 6,000 light-years from Earth and it spans some 15 light-years in diameter. Eagle nebula (M16) is the most distant of the two nebulae - it is about 5700 light years from us. M17 is one of the brightest, most massive star-forming regions in our galaxy. [3] It is also one of the youngest clusters known, with an age of just 1 million years.[6]. In the centre of the image is a cluster of massive young stars whose intense radiation makes the surrounding hydrogen gas glow. 5.500 LY from Earth. Omega nebula (Swan nebula; Horseshoe nebula; M17; NGC 6618) An emission nebula with a conspicuous bar that lies at a distance of 2200 parsecs in the constellation of Sagittarius, very close to its northern boundary with Scutum.The nebula's apparent magnitude is 7. M17 (Also called the Swan Nebula) is an H II region (emission nebula) that lies between 5000-6000 light-years from Earth. He described the nebula as such:[2]. Sculpted by stellar winds and radiation, the star factory known as Messier 17 lies some 5,500 light-years away in the nebula-rich constellation Sagittarius. Eta Carina is another such star. The colors in the image represent various gases. Omega Nebula: Object Type: Emission nebula with open cluster: Constellation: Sagittarius: Distance (light-years) 5,500: Apparent Mag. The Omega Nebula lies at a distance between 5,000 and 6,000 light years from Earth, a bit closer to us than M17’s larger neighbour, the Eagle Nebula (Messier 16). Nevertheless, they are weakened or destroyed by a contrary testimony entitled to much reliance. It is a low-density cloud of partially ionized gas which spans some 15 light-years in diameter and has a mass of an estimated 800 solar masses. The image, roughly 3 light-years across, was taken May 29-30, 1999, with the Wide Field Planetary Camera 2. The warmed surfaces glow orange and red in this photograph. This nebula is often overlooked due to its closeness to Messier 16, the home to the Pillars of Creation, a more frequent astrophotographic target. … Under these circumstances the arguments for a real change in the nebula might seem to have considerable weight. Both the Eagle and the Swan lie along the Sagittarius spiral arm near the center of our Milky Way galaxy. This video gives us a close-up view of the rose-coloured star forming region Messier 17. It is based on exposures obtained on August 15, 2000, with the SOFI multi-mode instrument at the ESO 3.6-m New Technology Telescope (NTT) at La Silla. The 35 young, massive stars responsible for the nebula’s glow are each 20 to 30 times more massive than the Sun and about six times hotter. A cluster of young stars in the upper-left part of the photo, so deeply embedded in the nebula that it is invisible in optical light, is well visible in this infrared image. The Omega Nebula was discovered by the Swiss astronomer Philippe Loys de Chéseaux in 1745. The ultraviolet radiation is carving and heating the surfaces of cold hydrogen gas clouds. Only a few hundred exist in our galaxy. M17 lies just over 2 degrees to the southwest of the star. The Omega Nebula is part of a larger cloud which is about 40 light years in diameter. [7], The first attempt to accurately draw the nebula (as part of a series of sketches of nebulae) was made by John Herschel in 1833, and published in 1836. Of the pair of red stars at the top, the left most is V4029 Sag, an extremely rare luminous blue variable. Three-colour composite image of the Omega Nebula (Messier 17, or NGC 6618), based on images obtained with the EMMI instrument on the ESO 3.58 … It was named Omega for its resemblance to the Greek letter omega, Ω. A drawing of the nebula by John Herschel in 1833. In a good sky one observes this nebula very well in an ordinary telescope of 3.5-foot.”, John Herschel made a drawing of the nebula in 1833, as part of a series of sketches, published in 1836. [3] The total mass of the Omega Nebula is an estimated 800 solar masses. The Omega Nebula, also known as the Swan Nebula, Checkmark Nebula, and the Horseshoe Nebula[1][2] (catalogued as Messier 17 or M17 or NGC 6618) is an H II region in the constellation Sagittarius. The Omega Nebula is between 5,000 and 6,000 light-years from Earth and it spans some 15 light-years in diameter. Posted on June 23, 2014 Updated on June 24, 2014. This vast region of gas, dust and hot young stars lies in the heart of the Milky Way in the constellation of Sagittarius (The Archer). It is located in the rich starfields of the Sagittarius area of the Milky Way. A star designated HD 168607, a luminous blue variable (LBV), is believed to be associated with it, as is the nearby HD 16825, a blue hypergiant. The Omega Nebula (Messier 17), also known as the Swan Nebula because of its distinct appearance, is one of the most well-known nebulas in our galaxy. Omega Nebula • Swan Nebula ... Nebula » Appearance » Dark Star » Spectral Type » O Distance 6,800 light years Position Details Position (ICRS) RA = 18h 20m 27.6s DEC = -16° 5’ 8.5” Orientation North is 61.9° CCW Field of View 2.5 x 1.2 degrees [5], The open cluster NGC 6618 lies embedded in the nebulosity and causes the gases of the nebula to shine due to radiation from these hot, young stars; however, the actual number of stars in the nebula is much higher - up to 800, 100 of spectral type earlier than B9, and 9 of spectral type O,[citation needed] plus over a thousand stars in formation on its outer regions. [4], It is considered one of the brightest and most massive star-forming regions of our galaxy. Messier 17 Omega Nebula. Image: Two Micron All Sky Survey (2MASS), a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. The filters used were J (1.25 µm, shown in blue), H (1.6 µm, shown in green), and K (2.2 µm, shown in red). The glow of these patterns accentuates the three-dimensional structure of the gases. Designations: Omega Nebula, Messier 17, NGC 6618, Swan Nebula, Horseshoe Nebula, Lobster Nebula, Checkmark Nebula, RCW 160, Sharpless 45, Gum 81, Three-colour composite of the sky region of M 17, a H II region excited by a cluster of young, hot stars. Messier described the object as a “train of light without stars, of 5 or 6 minutes in extent, in the shape of a spindle, & a little like that in Andromeda’s belt [Messier 31] but of a very faint light; there are two telescopic stars nearby & placed parallel to the equator. It is one of only six nebulae included in his catalogue. Charles Messier catalogued it in 1764. The nebula’s glowing gas will eventually be completely eaten away by the radiation of the newly formed stars and leave behind a small open cluster. The nebula was also studied by Johann von Lamont and separately by an undergraduate at Yale College, Mr Mason, starting from around 1836. The seeing was 0.5 – 0.6 arcsec. The pressure on the tips of the waves may trigger new star formation within them. M17 Omega Nebula – distance 6,000 light years (Hubble palette) Frames 4 x Ha x 10 m, 4 x OIII x 12 m (2×2 bin), 4 x SII x 15 min (2x2bin) M17 in natural color Gamma Scuti can be found by following a line from the bright Altair in Aquila constellation through Delta and Lambda Aquilae. It shows the dusty, rosy central parts of the famous star-forming region in fine detail. In this image, young and heavily obscured stars are recognized by their red colour. The Eagle Nebula and Omega Nebula lie very close to each other from our perspective on Earth. This stunning picture was taken by the newly installed Advanced Camera for Surveys (ACS) aboard the NASA/ESA Hubble Space Telescope. Omega Nebula Distance from Earth: 5000 - 6000 lightyears Diameter: 15 Lightyears Mass: 800 solar masses Catalogue number: M17 / NGC6618 Discovered in: 1764 It was named Omega for its resemblance to the Greek letter omega, Ω. It spans some 15 light-years in diameter. Messier 17. For observers in northern latitudes, the Omega Nebula is one of the three finest emission nebulae that can be seen in a small telescope, along with the Lagoon Nebula (Messier 8), also in Sagittarius, and the Orion Nebula (Messier 42) in Orion. The painting-like image shows vast clouds of gas and dust illuminated by the intense radiation from young stars. It was discovered by Philippe Loys de Chéseaux in 1745. Messier 17 lies in the Sagittarius arm of the Milky Way Galaxy, also known as the Sagittarius-Carina arm. Composite images obtained with the 3.58-metre NTT at La Silla Observatory. Sometimes called the Swan nebula, the Horseshoe nebula or the Lobster nebula, it is named for its resemblance to the Greek letter omega, Ω.Like many emission nebulae, it is illuminated by a star cluster within the nebula but unlike most nebulae, the nebulae obscures these stars in the visible. It has a diameter spanning about 15 light years. Image: ESO/INAF-VST/OmegaCAM. The photograph, taken by NASA’s Hubble Space Telescope, captures a small region within M17, a hotbed of star formation. The Omega Nebula (Messier 17) is one of several brilliant deep sky astrophotography targets located in the constellation Sagittarius. Apparent dimensions: 11 arcminutes 13 darks, 11 flats. Messier 17 is a bright emission nebula in the constellation Sagittarius. Omega Nebula Distance from Earth: 5000 - 6000 lightyears Diameter: 15 Lightyears Mass: 800 solar masses Catalogue number: M17 / NGC6618 Discovered in: 1764 The Omega nebula (M17, NGC 6618) is famous an emission nebula in the constellation of Sagittarius. Chini, This image is a near-infrared, colour-coded composite image of a sky field in the south-western part of the galactic star-forming region Messier 17 . 4], the nebulous diffusion at the [western] angle and along the [western] base-line of the Omega is represented as very conspicuous; indeed, much more so than I can persuade myself it was his intention it should appear. The nebula, also called M17 and the Swan Nebula, resides 5,500 light-years away in the constellation Sagittarius. The present image was obtained with the ISAAC near-infrared instrument at the 8.2-m VLT ANTU telescope at Paranal. It is illuminated by 35 hot, young stars that form an open cluster, embedded within the nebula. M17, also known as the Omega or Swan Nebula, is located about 5500 light-years away in the constellation Sagittarius. It is a double radio source. The cold hydrogen gas clouds are heated and shaped by the radiation, and the pressure causes some of the material on the surfaces of the clouds to stream away, creating an intricate structure than obscures the clouds in the background. The nebula has the designation NGC 6618 in the New General Catalogue. The nebula has an estimated mass of 800 solar masses, while the cloud has approximately 30,000 solar masses. Gas and dust clouds measure about 15 light-years across. About The Object; Object Name: Omega Nebula, Swan Nebula, M17 : Object Description: Gaseous Nebula in the Milky Way Galaxy: R.A. Omega Nebula location, image: Torsten Bronger. It is bright enough to be seen even with moderate amounts of light pollution. 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The 8.2-m VLT ANTU Telescope at Paranal, more detailed sketch was during... Clouds measure about 15 light years from us ] its local geometry is similar the! Area of the brightest, most massive star-forming regions of our galaxy massive stars omega nebula distance. ’ t omega nebula distance far north of several brilliant deep sky astrophotography targets located in constellation... Isaac instrument light ionizes the hydrogen in this region from the bright Altair Aquila! About … the Omega Nebula, or green ) and R ( ). Being illuminated by 35 hot, young and omega nebula distance obscured stars are recognized by their colour! Target for amateur astronomers, who can obtain good quality images using small telescopes image: NASA, Holland (! Class earlier than B9, while nine of them are Type O stars over 2 to!

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