| Nebula-class |
| Nebula starships aer only slightly smaller than Galaxy-class vessels. The saucer hulls and the warp nacelles of the two classes are substantially identical. The Nebula-class has a more compact arrangement of the hull components, however, it is equipped with an exchangeable sensor module. |
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| Phoenix Variant |
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| Prototype I |
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| Prototype II |
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| Prototype III |