The Horsehead Nebula in Orion (see Figure 11-3 in Comins,Discovering the Essential Universe,6th ed.)is a distinct dark region surrounded by brighter regions.The Horsehead is an example of a(n):

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The distinct dark region surrounded by brighter regions is a characteristic feature of a dark nebula. The Horsehead Nebula is an example of a dark nebula, as it is a dense cloud of gas and dust that blocks the light from behind it.

The Horsehead Nebula in Orion (See Figure 11-3 in Comins,Discovering