Interesting that USA launched people on LOX-ethanol (Mercury Redstone), LOX-kerosene (Mercury Atlas), N2O4-Aerozine (Gemini), LOX-kerosene-LH2 (Apollo), solids-

Interesting that USA launched people on LOX-ethanol (Mercury Redstone), LOX-kerosene (Mercury Atlas), N2O4-Aerozine (Gemini), LOX-kerosene-LH2 (Apollo), solids-LOX-LH2 (Shuttle) - and Russia (previously USSR) always actually used R-7 LOX-kerosene with almost the same launch pad... > Russia’s willingness to ferry passengers—including space tourists—gave NASA and other agencies a useful fallback option Remember how much NASA opposed the Dennis Tito flight. Doesn't look like a useful fallback. > the date by which the three astronauts presently on the ISS must use a Soyuz descent vehicle before its corrosive fuel renders the craft unusable I believe it's the fuel itself which deteriorates, not the craft. Peroxide is slowly self-decomposing.