Orion molecular cloud complex

and various telescopes that mapped CO in this part of the sky The following is a list of notable regions within the larger complex: • Orion A molecular cloud • The Orion Nebula, also known as M42 (part of Orion's Sword) • M43, which is part of the Orion Nebula • Sh2-279 (part of Orion's Sword) • NGC 1980 (part of Orion's Sword) • Orion Molecular Clouds • Orion molecular cloud 1 (OMC-1) with the Becklin–Neugebauer Object and the Kleinmann–Low Nebula • Orion molecular cloud 2 (OMC-2) • Orion molecular cloud 3 (OMC-3) • Orion molecular cloud 4 (OMC-4) • NGC 1981 • NGC 1999 • HH 222 (also known as Waterfall Nebula), above NGC 1999 • HH 34 a Herbig–Haro object with symmetric bow shocks • LDN 1641 • HH 1/2, the first recognized Herbig–Haro objects • Orion B molecular cloud • Flame Nebula (NGC 2024) • IC 434, which contains the Horsehead Nebula • The Horsehead Nebula (Barnard 33) • M78, a reflection nebula (NGC 2068) • McNeil's Nebula is a variable nebula discovered in 2004 near M78 • Orion East Cloud (LDN 1621 + LDN 1622) • HH 24-26 this group contains three Herbig–Haro objects • HH 111 one of the most well-known Herbig–Haro objects • Orion OB1 association • Orion's Belt • Sigma Ori cluster • 25 Ori cluster • Lambda Orionis molecular ring (Sh2-264) • Lambda Ori cluster • Barnard 30 • Barnard 35 (Angelfish nebula) • Orion-Eridanus superbubble • Barnard's Loop (Sh2-276) • IC 2118 • Eridanus Loop • Arc A • Arc B • Arc C A more complete list can be found for example in Maddalena et al. (1986) Table 1 == Individual components ==

and the newborn stars were imaged by ALMA and the VLA. Orion A The giant molecular cloud Orion A is the most active star-forming region in the local neighbourhood of the Sun. In the last few million years about 3000 young stellar objects were formed in this region, including about 190 protostars and about 2600 pre-main sequence stars. The Orion A cloud has a mass in the order of 105 . The stars in Orion A do not have the same distance to us. The "head" of the cloud, which also contains the Orion Nebula is about 1300 light-years (400 parsecs) away from the Sun. The "tail" however is up to 1530 light-years (470 parsecs) away from the Sun. The Orion A cloud is therefore longer than the projected length of 130 light-years (40 parsecs) and has a true length of 290 light-years (90 parsecs). Orion Molecular Clouds The Orion Molecular Clouds (OMC 1 to OMC 4) are molecular clouds located behind the Orion Nebula. Most of the light from the OMCs are blocked by material from the Orion Nebula, but some features like the Kleinmann-Low Nebula and the Becklin-Neugebauer object can be seen in the infrared. The clouds can be seen in the far-infrared and in radio wavelengths. The Trapezium Cluster has a small angular separation from the Kleinmann-Low Nebula, but the Trapezium Cluster is located inside the Orion Nebula, which is closer towards Earth. Orion B Orion B is about 1370 light-years (420 parsecs) from Earth. It has a size of about 1.5 kpc² and a mass in the order of 105 . It contains several star forming regions with the star cluster inside the Flame Nebula being the largest cluster. Superbubble . Parts of the Orion-Eridanus superbubble were first seen as Barnard's Loop in Hydrogen-alpha images that warp around the eastern portion of Orion. The other part of the superbubble that is seen in H-alpha is the Eridanus Loop. The walls of the entire bubble are seen in far-infrared and HI. Some features of the Eridanus Loop might be as close as 590 light-years (180 parsecs) to the Sun. == Gallery ==

File:Orion-Constellation.jpg|Orion from Leh with the molecular clouds visible. File:Sword of Orion, Orion nebula - Herschel - Nhsc2016-003b.tif|Orion A seen by ESA's Herschel Space Observatory File:Herschel’s view of a molecular cloud ESA384010.jpg|Orion B seen by ESA's Herschel Space Observatory File:Orion's Big Head Revealed in Infrared.jpg|The Lambda Orionis ring seen by NASA's Wide-field Infrared Survey Explorer File:BarnardLoopHunterWilson.jpg|H-alpha image of Barnard's Loop, which is part of the Orion–Eridanus Superbubble File:Hubble Sees the Force Awakening in a Newborn Star (23807356641).jpg|The Herbig–Haro object HH 24, which is located in Orion B File:Infant_Stars_in_Orion_-_chaotic_birth_of_stars.jpg|These four images taken by the NASA/ESA Hubble Space Telescope reveal the chaotic birth of stars in the Orion complex, the nearest major star-forming region to Earth. File:Short-wavelength NIRCam Orion mosaic in ESASky (ann2301a).jpg|NIRCam mosaic of the inner Orion Nebula File:Webb studies the Orion Nebula (weic2315a).jpg|The James Webb Space Telescope made the first detection of crucial carbon molecule ==See also==