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Astronomy Picture of the Day: Dec 31, 2013 -- The Horsehead Nebula

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Dec 31, 2013


The Horsehead Nebula
Image Credit & Copyright: John Chumack

Courtesy of http://apod.nasa.gov/apod/astropix.html
The Horsehead Nebula is one of the most famous nebulae on the sky. It is visible as the dark indentation to the red emission nebula in the center of the above photograph. The horse-head feature is dark because it is really an opaque dust cloud that lies in front of the bright red emission nebula. Like clouds in Earth's atmosphere, this cosmic cloud has assumed a recognizable shape by chance. After many thousands of years, the internal motions of the cloud will alter its appearance. The emission nebula's red color is caused by electrons recombining with protons to form hydrogen atoms. Also visible at the bottom left of the picture is a greenish reflection nebulae that preferentially reflects the blue light from nearby stars.

 

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