Tags Open Lines Dr. John Jurist Jim Davis blog post When Physics, Economics, & Reality Collide, rocket reusability rocket fuel Methane Falcon 9 heavy lift rockets USAF Saturn 5 range fees vehicle scaling up vehicle scaling down LEO orbital flight docking launch vehicle flyback aerospike SSTO SUSTAIN Nuclear propulsion Tardigrades OST planetary protection Article 6 OST Starlink ESA crimes in space LEO smallsat congestion SpaceX smallsat thrusters Space debris Guest Dr. David Livingston Tagline Open Lines - The topics you want to talk about. First time callers wanted. Space, STEM, STEAM & Science topics welcome View the discussion thread.