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Orion Nebula

Diffuse nebula in the constellation Orion / From Wikipedia, the free encyclopedia

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The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the constellation of Orion,[b] and is known as the middle "star" in the "sword" of Orion. It is one of the brightest nebulae and is visible to the naked eye in the night sky with apparent magnitude 4.0. It is 1,344 ± 20 light-years (412.1 ± 6.1 pc) away[3][6] and is the closest region of massive star formation to Earth. The M42 nebula is estimated to be 24 light-years across (so its apparent size from Earth is approximately 1 degree). It has a mass of about 2,000 times that of the Sun. Older texts frequently refer to the Orion Nebula as the Great Nebula in Orion or the Great Orion Nebula.[7]

Quick facts: Diffuse nebula, Observation data J2000 epoch...
Orion Nebula
Diffuse nebula
The entire Orion Nebula in a composite image of visible light and infrared; taken by Hubble Space Telescope in 2006
Observation data: J2000 epoch
Right ascension05h 35m 17.3s[2]
Declination−05° 23 28[2]
Distance1,344±20 ly   (412[3] pc)
Apparent magnitude (V)4.0[4]
Apparent dimensions (V)65×60 arcmins[5]
Physical characteristics
Radius12[a] ly
Absolute magnitude (V)
Notable featuresTrapezium cluster
DesignationsNGC 1976, M42,
LBN 974, Sharpless 281
See also: Lists of nebulae

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.[8] 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 and brown dwarfs within the nebula, intense and turbulent motions of the gas, and the photo-ionizing effects of massive nearby stars in the nebula.

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