What type of nebula is the Horsehead Nebula?

Planetary Nebulae
Emission Nebulae
Reflection Nebulae
Dark Nebulae
Dark nebulae are clouds of dust which are simply blocking the light from whatever is behind. They are physically very similar to reflection nebulae; they look different only because of the geometry of the light source, the cloud and the Earth. Dark nebulae are also often seen in conjunction with reflection and emission nebulae. A typical diffuse nebula is a few hundred light-years across. (NGC 2264 shown; see also the Horsehead Nebula)
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Planetary Nebulae
Emission Nebulae
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36%
18%
36%
11
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28%
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14
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619
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12%
15%
39
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22%
0%
18