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Below is a list of the largest known nebulae so far discovered, ordered by actual diameter. This list is prone to change because of inconsistencies between studies, the great distances of nebulae from our stellar neighborhood, and the constant refinement of technology and engineering.
Nebulae have no standardized boundaries, so the measurements are subject to revision. Lastly, scientists are still defining the features and parameters of nebulae. Because of these rapid developments and adjustments, this list might be potentially unreliable.
Image | Nebula | Maximum dimension (in light-years/parsecs) | Type | Notes |
---|---|---|---|---|
NGC 262 Halo Cloud | 1,300,000 ly (400,000 pc) [1] | H I region | Spiral nebula surrounding NGC 262, which is one of the largest known galaxies. | |
Leo Ring | 650,000 ly (200,000 pc) [2] | HVC | ||
Magellanic Stream | 600,000 ly (180,000 pc) [3] | complex of HVCs | Connects the Large and Small Magellanic clouds; extends across 180° of the sky. | |
Lyman-alpha blob 1 | 300,000 ly (92,000 pc) [4] | LαB | Largest blob in the LAB Giant Concentration [ citation needed ] | |
Himiko Gas Cloud | 55,000 ly (17,000 pc) [5] | Intergalactic cloud (possible LαB) | One of the most massive lyman-alpha blobs known | |
HVC 127-41-330 | 20,000 ly (6,100 pc) [6] | HVC | ||
Smith's Cloud | 9,800 ly (3,000 pc) [7] | HVC | Extends about 20° of the sky | |
Tarantula Nebula | 1,895 ly (581 pc) [8] [lower-alpha 1] | H II region | Most active starburst region in the Local Group | |
NGC 604 | 1,520 ly (470 pc) [9] [10] [lower-alpha 2] | H II region | Located in the Triangulum Galaxy | |
N44 | 1,000 ly (310 pc) [11] | Emission nebula | ||
N11 | 1,000 ly (310 pc) [12] | H II region | ||
NGC 2404 | 940 ly (290 pc) | H II region | Largest H II region located in the spiral galaxy NGC 2403 | |
NGC 595 | 880 ly (270 pc) [13] | H II region | ||
Ring Nebula (NGC 6822) | 838 ly (257 pc) | H II region | The Ring Nebula is located in the lower right of the image | |
Gum Nebula | 809–950 ly (248–291 pc) [14] [15] | Emission nebula | Extends about 36° of the sky | |
Bubble Nebula (NGC 6822) | 758 ly (232 pc) [16] [17] [18] | H II region | The Bubble Nebula is located in the upper left of the image | |
NGC 6188 | 600 ly (180 pc) [19] | Emission nebula | ||
NGC 592 | 580 ly (180 pc) [20] [21] | H II region | ||
Sh2-310 | 531–681 ly (163–209 pc) [22] [lower-alpha 3] | H II region | Nebula surrounding VY Canis Majoris, which is one of largest known stars. | |
Carina Nebula | 460 ly (140 pc) [23] | H II region | Nearest giant H II region to Earth | |
Dragonfish Nebula | 450 ly (140 pc) [24] | Emission nebula | ||
N119 | 430–570 ly (131–175 pc) [25] | H II region | Peculiar S-shape | |
RCW 49 | 350 ly (110 pc) [26] | H II region | ||
Heart Nebula | 330 ly (100 pc) [27] | H II region | ||
Henize 70 (N70 or DEM L301) [28] | 300 ly (92 pc) [29] | H II region | The N 70 Nebula, in the Large Magellanic Cloud has a shell structure and is really a bubble in space. It is a "Super Bubble". | |
Barnard's Loop | 300 ly (92 pc) [30] [31] | H II region | ||
Sh2-54 | 252 ly (77 pc) [32] [33] | H II region | ||
Prawn Nebula | 250 ly (77 pc) [34] | H II region | ||
Simeis 147 | 160 ly (49 pc) [35] | Supernova remnant | ||
NGC 7822 | 150 ly (46 pc) [36] | Emission nebula | ||
IC 2944 | 142 ly (44 pc) [37] [38] | Emission nebula | ||
Eagle Nebula | 140 ly (43 pc) [39] | H II region | Part of another diffuse nebula IC 4703. | |
Rosette Nebula | 130 ly (40 pc) [40] | H II region | ||
RCW 79 | 122 ly (37 pc) [41] | Emission nebula | ||
Lagoon Nebula | 110 ly (34 pc) [42] | H II region | ||
NGC 3576 | 100 ly (31 pc) [43] | Emission nebula | ||
N41 | 100 ly (31 pc) [44] | Emission nebula | ||
The following well-known nebulae are listed for the purpose of comparison. | ||||
Orion Nebula | 20 ly (6.132 pc) [45] | Diffuse Nebula | ||
Crab Nebula | 11 ly (3.4 pc) [46] | Supernova remnant | ||
Bubble Nebula | 6 [47] -10 [48] [49] ly (1.84-3.066 pc) | Emission nebula | ||
Helix Nebula | 5.74 ly (1.76 pc) [50] | Emission nebula | ||
Eightburst Nebula | 0.8 ly (0.2453 pc) [51] | Emission nebula | ||
Homunculus Nebula | 0.58 ly (0.1778 pc) [52] | Emission nebula | Surrounds the star system Eta Carinae. | |
Stingray Nebula | 0.16 ly (0.049 pc) [53] | Emission nebula | One of the smallest nebulae. |
The Triangulum Galaxy is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC (New General Catalogue) 598. With the D25 isophotal diameter of 18.74 kiloparsecs (61,100 light-years), the Triangulum Galaxy is the third-largest member of the Local Group of galaxies, behind the Andromeda Galaxy and the Milky Way.
NGC 604 is an H II region inside the Triangulum Galaxy. It was discovered by William Herschel on September 11, 1784. It is among the largest H II regions in the Local Group of galaxies; at the galaxy's estimated distance of 2.7 million light-years, its longest diameter is roughly 1,520 light years (~460 parsecs), over 40 times the size of the visible portion of the Orion Nebula. It is over 6,300 times more luminous than the Orion Nebula, and if it were at the same distance it would outshine Venus. Its gas is ionized by a cluster of massive stars at its center with 200 stars of spectral type O and WR, a mass of 105 solar masses, and an age of 3.5 million years; however, unlike the Large Magellanic Cloud's Tarantula Nebula central cluster (R136), NGC 604's one is much less compact and more similar to a large stellar association.
The Tarantula Nebula is a large H II region in the Large Magellanic Cloud (LMC), forming its south-east corner.
Centaurus A is a galaxy in the constellation of Centaurus. It was discovered in 1826 by Scottish astronomer James Dunlop from his home in Parramatta, in New South Wales, Australia. There is considerable debate in the literature regarding the galaxy's fundamental properties such as its Hubble type and distance. NGC 5128 is one of the closest radio galaxies to Earth, so its active galactic nucleus has been extensively studied by professional astronomers. The galaxy is also the fifth-brightest in the sky, making it an ideal amateur astronomy target. It is only visible from the southern hemisphere and low northern latitudes.
Minkowski 2-9, abbreviated M2-9 is a planetary nebula that was discovered by Rudolph Minkowski in 1947. It is located about 2,100 light-years away from Earth in the direction of the constellation Ophiuchus. This bipolar nebula takes the peculiar form of twin lobes of material that emanate from a central star. Astronomers have dubbed this object as the Twin Jet Nebula because of the jets believed to cause the shape of the lobes. Its form also resembles the wings of a butterfly. The nebula was imaged by the Hubble Space Telescope in the 1990s.
The Whirlpool Galaxy, also known as Messier 51a (M51a) or NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus. It lies in the constellation Canes Venatici, and was the first galaxy to be classified as a spiral galaxy. It is 7.22 megaparsecs away and 23.58 kiloparsecs (76,900 ly) in diameter.
The Sombrero Galaxy is a peculiar galaxy of unclear classification in the constellation borders of Virgo and Corvus, being about 9.55 megaparsecs from the Milky Way galaxy. It is a member of the Virgo II Groups, a series of galaxies and galaxy clusters strung out from the southern edge of the Virgo Supercluster. It has an isophotal diameter of approximately 29.09 to 32.32 kiloparsecs, making it slightly bigger in size than the Milky Way.
Messier 106 is an intermediate spiral galaxy in the constellation Canes Venatici. It was discovered by Pierre Méchain in 1781. M106 is at a distance of about 22 to 25 million light-years away from Earth. M106 contains an active nucleus classified as a Type 2 Seyfert, and the presence of a central supermassive black hole has been demonstrated from radio-wavelength observations of the rotation of a disk of molecular gas orbiting within the inner light-year around the black hole. NGC 4217 is a possible companion galaxy of Messier 106.
The Sculptor Galaxy is an intermediate spiral galaxy in the constellation Sculptor. The Sculptor Galaxy is a starburst galaxy, which means that it is currently undergoing a period of intense star formation.
NGC 891 is an edge-on unbarred spiral galaxy about 30 million light-years away in the constellation Andromeda. It was discovered by William Herschel on October 6, 1784. The galaxy is a member of the NGC 1023 group of galaxies in the Local Supercluster. It has an H II nucleus.
NGC 2438 is a planetary nebula in the southern constellation of Puppis. Parallax measurements by Gaia put the central star at a distance of roughly 1,370 light years. It was discovered by William Herschel on March 19, 1786. NGC 2438 appears to lie within the cluster M46, but it is most likely unrelated since it does not share the cluster's radial velocity. The case is yet another example of a superposed pair, joining the famed case of NGC 2818.
NGC 1705 is a peculiar lenticular galaxy and a blue compact dwarf galaxy (BCD) in the southern constellation of Pictor, positioned less than a degree to the east of Iota Pictoris, and is undergoing a starburst. With an apparent visual magnitude of 12.6 it requires a telescope to observe. It is estimated to be approximately 17 million light-years from the Earth, and is a member of the Dorado Group.
IC 342 is an intermediate spiral galaxy in the constellation Camelopardalis, located relatively close to the Milky Way. Despite its size and actual brightness, its location behind dusty areas near the galactic equator makes it difficult to observe, leading to the nickname "The Hidden Galaxy", though it can readily be detected even with binoculars. If the galaxy were not obscured, it would be visible by naked eye. The dust makes it difficult to determine its precise distance; modern estimates range from about 7 million light-years (Mly) to about 11 Mly. The galaxy was discovered by William Frederick Denning in 1892. It is one of the brightest in the IC 342/Maffei Group, one of the closest galaxy groups to the Local Group. Edwin Hubble first thought it to be in the Local Group, but it was later determined not to be a member.
NGC 6302 is a bipolar planetary nebula in the constellation Scorpius. The structure in the nebula is among the most complex ever observed in planetary nebulae. The spectrum of NGC 6302 shows that its central star is one of the hottest stars known, with a surface temperature in excess of 250,000 degrees Celsius, implying that the star from which it formed must have been very large.
The Flame Nebula, designated as NGC 2024 and Sh2-277, is an emission nebula in the constellation Orion. It is about 1350 light-years away. At that distance, the Flame Nebula lies within the Orion B cloud of the larger Orion Molecular Cloud Complex.
NGC 602 is a young, bright open cluster of stars located in the Small Magellanic Cloud (SMC), a satellite galaxy to the Milky Way. It is embedded in a nebula known as N90.
NGC 6357 is a diffuse nebula near NGC 6334 in the constellation Scorpius. The nebula contains many proto-stars shielded by dark discs of gas, and young stars wrapped in expanding "cocoons" or expanding gases surrounding these small stars. It is also known as the Lobster Nebula. This nebula was given the name War and Peace Nebula by the Midcourse Space Experiment scientists because of its appearance, which, in infrared images the bright, western part resembles a dove, while the eastern part looks like a skull. A petition by anime fans to rename it as the Madokami nebula, due to resemblance with a character, was unsuccessful.
NGC 6334, colloquially known as the Cat's Paw Nebula, or Gum 64, is an emission nebula and star-forming region located in the constellation Scorpius. NGC 6334 was discovered by astronomer John Herschel in 1837, who observed it from the Cape of Good Hope in South Africa. The nebula is located in the Carina–Sagittarius Arm of the Milky Way, at a distance of approximately 5.5 kilolight-years from the Sun.
The Dark Doodad Nebula is a dark nebula near the globular cluster NGC 4372, much closer than the centre of the galaxy and in the galactic plane, having a length of nearly three degrees of arc. Although officially unnamed, this long molecular cloud has come to be known under this name. It can be found in the southern constellation of Musca with strong binoculars.
NGC 1313 is a field galaxy and a irregular galaxy discovered by the Scottish astronomer James Dunlop on 27 September 1826. It has a diameter of about 50,000 light-years, or about half the size of the Milky Way.
30 Doradus .. 49 kpc +- 3 kpc