"A nebula is an interstellar cloud of dust, gas, and plasma, where star formation usually occurs. In the year 2400, the Federation introduced a new system to classify nebulae. The new system first assigns the nebula a letter designation based upon its general composition. If the nebula has any unusual quirks, it is assigned an additional number designation. For example, a Class F2 Nebula is a Dark Nebula that contains disruptive electromagnetic radiation."
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| URI | http://bartoc.org/en/node/17741 |
| Homepage | http://sttff.net/ast/AST_nebulaclassification.html |
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| Size | 11 classes (2016-08). |
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