The horsehead nebula is one of the most well known nebulas in the sky. The red center is visible to us from Earth because it is an extremely opaque dust cloud that lies in from of the bright red emission nebula. The emission's red color is due to the combination of electrons recombining with protons to form hydrogen atoms. I chose this photo because it's something that is possible to observe, and I have added it to the things I look for during my observations.
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