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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The Horsehead Nebula lies in the constellation Orion, about 1300 light-years away, and is a popular target for amateur and professional astronomers alike.
The new far-infrared Herschel view shows in spectacular detail the scene playing out around the Horsehead Nebula at the right-hand side of the image, where it seems to surf like a "white horse" in the waves of turbulent star-forming clouds.
Looking like an apparition rising from whitecaps of interstellar foam, the iconic Horsehead Nebula has graced astronomy books ever since its discovery more than a century ago.
For images and more information about the Horsehead Nebula, visit:
The gas and dust in the Horsehead Nebula do not make any light that your eye can see.
They found that the Horsehead Nebula is slowly spinning.
Audiences voyage through the universe visiting star clusters and giant gas clouds such as the Horsehead Nebula, providing a dramatic view of the universe as revealed by this extraordinary projection system.
In visible light, Orion's well-known Horsehead nebula looks like a dark dust cloud.
So unlike the Horsehead nebula, these things are still black.
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.
All of this nebulosity, along with many other objects that extend throughout Orion such as the Horsehead Nebula (B33) and the Flame Nebula (NGC 2024) are associated, and collectively known as the Orion Molecular Cloud Complex.