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The NX class was the first warp 5 deep space exploration vessel of United Earth. The first ship of the class, the Enterprise (NX-01) was launched in 2151 and made first contact with a number of species in the Alpha Quadrant, including the Klingon and Romulan Empires, the Ferengi, and a number of unknown species. The ship will later be refitted in the 2160s and many others of the class will go on to service in the 23rd century. Others ships of the class are the Columbia (NX-02) and in the Mirror Universe ISS Avenger (NX-09), but the overall number of NX class vessels would be around 12-20.