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Orion Nebula

Orion Nebula The entire Orion Nebula in visible light. Credit: NASA/ESA Observation data: J2000 epoch Type Reflection and Emission Right ascension 05h 35m 17.3s Declination -05° 23' 28? Distance 1,344±20 ly (412 pc) Apparent magnitude (V) +4.0 Apparent dimensions (V) 65×60 arcmins Constellation Orion Physical characteristics Radius 12 ly Absolute magnitude (V) — Notable features Trapezium cluster Other designations NGC 1976, M42, LBN 974, Sharpless 281 See also: Diffuse nebula, Lists of nebulae v t e The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated south of Orion's Belt in the constellation of Orion. It is one of the brightest nebulae, and is visible to the naked eye in the night sky. M42 is located at a distance of 1,344 ± 20 light years and is the closest region of massive star formation to Earth. The M42 nebula is estimated to be 24 light years across. It has a mass of about 2000 times the mass of the Sun. Older texts frequently refer to the Orion Nebula as the Great Nebula in Orion or the Great Orion Nebula.The Orion Nebula is one of the most scrutinized and photographed objects in the night sky, and is among the most intensely studied celestial features. The nebula has revealed much about the process of how stars and planetary systems are formed from collapsing clouds of gas and dust. Astronomers have directly observed protoplanetary disks, brown dwarfs, intense and turbulent motions of the gas, and the photo-ionizing effects of massive nearby stars in the nebula. There are also supersonic "bullets" of gas piercing the hydrogen clouds of the Orion Nebula. Each bullet is ten times the diameter of Pluto's orbit and tipped with iron atoms glowing bright blue. They were probably formed one thousand years ago from an unknown violent event. Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
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