Hello! Astronomy Picture of the Day - October 6th, 2019
Today's video is about 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
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