J-2 Rocket Engine
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Main Article: J-2 | Technologies: Bipropellant | Gas-generator cycle | LOX | LH2 | ||
| Historic Spacecraft: Saturn IB (S-IVB) | Saturn V (S-II, S-IVB) | ||||
| Future Spacecraft: Ares I | Ares IV | Ares V | Earth Departure Stage | Lunar Surface Access Module | ||||
| Other LOX/LH2 Engines: SSME | RS-68 | ||||