Nebula is one of the most famous nebulae on the
It is visible as the dark indentation to the red
in the center of the above photograph.
feature is dark because it is really an opaque
dust cloud that lies in
front of the bright red
Like clouds in
Earth's atmosphere, this cosmic cloud has
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
Also visible at the bottom left of the picture is a greenish
reflection nebulae that
the blue light from
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