List of Propulsion Systems

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Moon launched

• Mass Driver
  
• Chemical Propellants
  (see In Situ Propellant Production)
• Maglev launcher -- a la Gerard O'Neill and/or Heinlein
• Hydrogen Gas Gun
• Ring launch or line launch
• Lunar Rocket-sled to Orbit
• Wheel rolling at orbital speed

Earth launched

• Conventional Chemical -- (links to Astronautix might be useful here)
  
• ATO, Airship To Orbit as per JP Aerospace
  
• PDE, Pulse Detonation Engine
  
• SCRAMJet
  
• Space Elevator
  
• Rockoon 'Rockets launched from balloons'
  
• Tether
  
• Inverted-aerobraking
  
• Momentum from GTO
  

Interplanetary Transfer

• Conventional Chemical -- (links to Astronautix might be useful here)
• Nuclear -- Orion.
• Magnetoplasma
• Ion propulsion

• Solar sail
• Tether