Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • abbreviation astronomy The Orion Nebula; a diffuse nebula located at a distance of approximately 1600 light years from Earth, in the direction of the constellation Orion.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Charles Messier, who first published Nebulae and Star Clusters in 1774 as a listing of visible objects in the night sky that were not stars. Objects in Messier's catalog are numbered, and the letter M (for Messier) is prepended to these numbers.

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Examples

  • Binoculars or small telescopes reveal the beautiful Orion Nebula, which is otherwise known as M42, if you have a dark-enough sky.

    Earth & Sky Podcast 2009

  • Also known as M42, the nebula is visible to the unaided eye, but this stunning infrared view from the Spitzer Space Telescope penetrates the turbulent cosmic gas and dust clouds to explore the region in unprecedented detail.

    Recently Uploaded Slideshows 2009

  • One will say [M42: 12th St Pier] and the other will say [M42: Javits Center].

    What to download for your BEA trip « The Book Publicity Blog 2009

  • That leaves elderly people, disabled people, hot people, cold people and people lugging heavy things stuck on the M42.

    The Bus You Can Outwalk Andrew Grossman 2010

  • They were on the M42 motorway by the time Annabel seemed to feel she had a firm grip on the world of magic, and by then Mae was panicking.

    The Demons Covenant Sarah Rees Brennan 2010

  • Hell I can own a M42 if I want to put up with federal intrusions.

    Petzal on Palin: Who Thought McCain was That Smart? 2008

  • Surrounding Iota is a faint stardust nebula, NGC 1980, often mistaken as part of M42.

    Weekend SkyWatcher's Forecast: February 5-7, 2010 | Universe Today 2010

  • The M42 narrowly beat out the M14A, which runs from the Lower East Side to the West Village via 14th Street.

    The Bus You Can Outwalk Andrew Grossman 2010

  • They were on the M42 motorway by the time Annabel seemed to feel she had a firm grip on the world of magic, and by then Mae was panicking.

    The Demons Covenant Sarah Rees Brennan 2010

  • According to the Metropolitan Transportation Authority, the bus routes that run along the closed streets, the M15, M50 and M42, will be rerouted and likely face delays because of the detours.

    General Assembly Closures Begin 2010

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