Horsehead Nebula

Horsehead Nebula

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Caption: Horsehead Nebula, optical image. North is at left. The distinctive horsehead shape is formed by the dark nebula B33 being silhouetted against the bright emission nebula IC 434. The blue-white area at lower left is the reflection nebula NGC 2023. An emission nebula is a cloud of gas and dust that glows as the hydrogen gas it contains is ionised by hot stars within it. A reflection nebula does not emit light, but reflects the light from other stars. The nebulae lie about 1500 light years away in the constellation Orion. Photographed by the NSF 0.9-metre telescope, Kitt Peak, Arizona, USA.

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Keywords: astronomical, astronomy, astrophysical, astrophysics, awe, awesome, b33, cloud, clouds, cosmology, dark, dust, emission, evolution, gas, horsehead nebula, ic 434, kitt peak, nebulae, ngc 2023, nsf, optical, orion, reflection, science, space, star birth, starbirth, stellar formation, universe

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