Tags Open Lines Dr. John Brandenburg Space Show blog considerations theory vs. hypothesis thermo-nuclear explosions on Mars XE 129 opinion vs. fact Falcon Heavy point to point suborbital flight SpaceX BFR super nova methane propellant Dr. Jeff Bell Marshall equatorial LEO space station space station paradigm shift 1 g space station Axiom Space NASA HSF budget U.S. Congress & NASA budget ISS costs SLS costs SLS fairing size Michael Listner Main spaceport Parabolic Arc on Bigelow Space operations company. Freemont John on Astra Rocket Company in the Bay Area Dr. Doug empty upper stage as ideal depot Dr. Bob Zubrin Brandenburg Big G gravity constant Guest Dr. David Livingston Tagline Open Lines - The topics you want to talk about. First Time callers welcome View the discussion thread.