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- NGC2023 is the famous "Horsehead
- Nebula" and is considered one of the
- best examples of a dark nebula. This is
- a cloud of gas which has no embedded
- stars and is in front of an illuminated
- patch. What we see then is the silhouette
- of the object instead of the object
- itself. The Horsehead is a very
- difficult object to see with the naked
- eye.