The Horsehead Nebula


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 surely alter its appearance. The emission nebula‘s red color is caused by electrons recombining with protons to form hydrogen atoms. On the image left is the Flame Nebula, an orange-tinged nebula that also contains filaments of dark dust. Just to the lower left of the Horsehead nebula featured picture is a blueish reflection nebulae that preferentially reflects the blue light from nearby stars.

from NASA http://ift.tt/1lPuhBd
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One thought on “The Horsehead Nebula

  1. Hi there! This post couldn’t be written any better! Reading through this
    post reminds me of my old room mate! He always kept chatting
    about this. I will forward this article to him. Fairly certain he will
    have a good read. Many thanks for sharing!

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