- a luminous nebula in the constellation Orion, in the center of Orion's sword. Also called Great Nebula of Orion.
* * *Bright nebula, faintly visible to the unaided eye in the sword of the hunter's figure in the constellation Orion.About 1,500 light-years from Earth, it contains hundreds of very hot young stars clustered about a group of four massive stars known as the Trapezium. Radiation primarily from these four stars excites the nebula to glow. Discovered in the early 17th century, it was the first nebula to be photographed (1880).
* * *(catalog numbers NGC 1976 and M 42), bright diffuse nebula, faintly visible to the unaided eye in the sword of the hunter's figure in the constellation Orion. The nebula lies about 1,350 light-years from Earth and contains hundreds of very hot (O-type) young stars clustered about a nexus of four massive stars known as the Trapezium. Radiation from these stars excites the nebula to glow. It was discovered in 1610 by the French scholar Nicolas-Claude Fabri de Peiresc (Peiresc, Nicolas-Claude Fabri de) and independently in 1618 by the Swiss astronomer Johann Cysat. It was the first nebula to be photographed (1880), by Henry Draper (Draper, Henry) in the United States.Images of the nebula continued to improve, and technological advances in the late 1980s enabled scientists to photograph infrared-emitting objects in the Orion Nebula that had never before been observed optically. The Hubble Space Telescope in 1991 revealed the sharpest details yet available of known features of the nebula, including what appeared to be a jet (an energetic outflow) related to the birth of a young star.
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Orion Nebula — The entire Orion Nebula in visible light. Credit: NASA/ESA Observation data: J2000 epoch … Wikipedia
Orion Nebula — Astron. a luminous nebula in the constellation Orion, in the center of Orion s sword. Also called Great Nebula of Orion … Useful english dictionary
Orion Nebula — noun A diffuse nebula visible in the night sky below Orions Belt; it is approximately 40 light years across. It is one of the brightest nebulae visible to the naked eye and is the closest region of stellar formation to Earth. Syn: M42, NGC … Wiktionary
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nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula … Universalium
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