The term class 9 could refer to:

• Class 9 gas giant, a type of planet
• Class 9 nebula, a type of nebula
• Class 9 neutronic wavefront, a type of neutronic wavefront
• Class 9 photon torpedo, a type of torpedo
• Class 9 pulsar, a type of pulsar
• Class 9 cargo vessel, a type of space vessel
• Class 9 warp drive, a type of warp drive

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