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physical object > naked eye object > Orion Nebula
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Orion Nebula
(M 42)
subjectfact 
Orion Nebulahas illuminating star(s) trapezium2001-09-27 09:30:19.0
is a part of Orion2001-09-27 09:30:18.0
has age 20000 yearshas source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:30:19.0
has Messier number 422001-09-27 09:30:19.0
has distance 500 pchas source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:30:19.0
has synonym M 422001-09-27 09:30:19.0
has image has URL: http://oposite.stsci.edu/pubinfo/PR/95/45.html, 2001-09-27 09:30:18.0
has definition A large cloud of gas and dust giving birth to young stars in the constellation Orion and visible to the naked eye. It is an HII region 1500 light-years away.has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:30:18.0
has definition An HII region about 500 pc distant, barely visible to the naked eye in the center of Orion's sword. It is undoubtedly a region where stars are being born; young O stars and many T Tauri variables are associated with it, and its members are extreme Population I. Probably no more than 20000 years old. It is also an X-ray source (3U 0527-05 and M42, NGC 1976).has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:30:19.0
has definition The Orion Nebula, a star-forming region in the constellation Orion.has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:30:19.0
is an instance of gaseous nebula2001-09-27 09:30:18.0
is an instance of naked eye object2001-09-27 09:30:18.0
is an instance of Messier objecthas URL: http://www.seds.org/messier/m/m042.html, 2001-09-27 09:30:18.0
Messier objecthas apparent dimension2001-09-27 09:30:24.0
has apparent magnitude2001-09-27 09:30:24.0
is a part of celestial sphere2001-09-27 09:30:24.0
has catalog Messier catalog2001-09-27 09:30:24.0
has purpose originally to catalog all objects which could be confused with a comet2001-09-27 09:30:24.0
gaseous nebulahas catalog gaseous nebula catalog2001-09-27 09:30:11.0
celestial bodyhas spectra2001-09-27 09:30:09.0
H II regionhas composition ionized hydrogen2001-09-27 09:30:11.0
physical objecthas location or center of gravity2001-09-27 09:27:27.0
has angular momentum2001-09-27 09:27:27.0
has mass2001-09-27 09:27:27.0
has velocity2001-09-27 09:27:27.0
has momentum2001-09-27 09:27:27.0
has temperature2001-09-27 09:27:27.0
has volume2001-09-27 09:27:27.0
has extent2001-09-27 09:27:27.0
has material2001-09-27 09:27:27.0
nebulais a part of gas2001-09-27 09:32:19.0

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