List of Propulsion Systems

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Moon launched

• Chemical Propellants (see also In Situ Propellant Production)
  • Hydrogen
  • Sulfur
  • Aluminum
  • Silicon
• Maglev launcher -- a la Gerard O'Neill and/or Heinlein
• Ring launch or line launch

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
  
• Mass Driver
  
• 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