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Mini-Mag Orion (MMO) or Miniature Magnetic Orion is a proposed type of spacecraft propulsion based on the Project Orion nuclear propulsion system. The Mini-Mag Orion system achieves propulsion by compressing fissile material in a magnetic field, a Z-pinch, until fission occurs. This fission reaction propels the craft. MMO should be able to propel 100 tons to Mars within 3 months or to Jupiter in about one year.

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