Horsehead nebula

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Horsehead Nebula,

dark nebulanebula
[Lat.,=mist], in astronomy, observed manifestation of a collection of highly rarefied gas and dust in interstellar space. Prior to the 1960s this term was also applied to bodies later discovered to be galaxies, e.g.
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 located in the constellation Orion; designated IC 434 or B 33. It consists of a cloud of nonluminous interstellar matterinterstellar matter,
matter in a galaxy between the stars, known also as the interstellar medium. Distribution of Interstellar Matter

Compared to the size of an entire galaxy, stars are virtually points, so that the region occupied by the interstellar matter
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 resembling the outline of a horse's head and appears against the background of a bright emission nebula. The Horsehead Nebula measures about 4 min of arc at its greatest width. It is located near the belt of Orion at a distance of about 1,600 light-years from the earth.

Horsehead nebula

(IC 434) A dark nebula in Orion located near the star Zeta (ζ) Orionis. It is seen as a dark distinctively shaped region silhouetted against the bright background of an emission (H II) nebula.

Horsehead Nebula

[′hȯrs‚hed ′neb·yə·lə]
A cloud of obscuring particles between the earth and a gaseous emission nebula in the constellation Orion.
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References in periodicals archive ?
Orions Horsehead Nebula is an iconic interstellar feature and a prime laboratory for studying star formation processes.
The Horsehead Nebula lies in the constellation Orion, about 1300 light-years away, and is a popular target for amateur and professional astronomers alike.
Topping off Discover Astronomy is a full-screen Photo Gallery, which features stunning full-color astro-photographs of fascinating astronomical phenomenon, such as the doomed comet Shoemaker-Levy 9, the Horsehead Nebula, and Voyager 2 photos of Saturn and Neptune.
Alnitak (below center), the easternmost star in Orion's Belt, anchors a rich region of nebulosity that features the broad glow of IC 434, with the Horsehead Nebula (Barnard 33) silhouetted against it, and the Flame Nebula (NGC 2024) at bottom center.
This image of the Horsehead Nebula was captured by the Hubble Space Telescope, it's illuminated by the Sigma Orionis.
Mr Johnstone closed his talk with a series of photographs taken using the method described, including images of M33, M51 and the Horsehead Nebula.
In visible light, Orion's well-known Horsehead nebula looks like a dark dust cloud.
This detailed image of the Horsehead Nebula, Barnard 33, displays richly saturated color without going overboard.
Orion's Horsehead nebula seemed almost unique in having retained a constant popularity throughout the past 30 years, probably because it had always been a significant photographic challenge, yet was tantalisingly just within visual reach.
Marvel at the Horsehead nebula, silhouetted against a background of gas and dust aglow in blues, reds, and purples.
News Editor MONICA YOUNG has glimpsed the Horsehead Nebula on the very plate from which Williamina Fleming discovered it.