List of Propulsion Systems
Moon launched
LOX-Aluminium -- derived from lunar oxygen and mined aluminium
LOX-Hydrogen -- derived from polar ice
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)
SCRAMJet
Space Elevator
Tether
Inverted-aerobraking
