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To get enough fuel β½ into #orbit for a #Mars π΄ mission would require at least 10 launches of the #SLS rocket, or about $20 billion π°. Just for the fuel. To use traditional propulsion, one needs to push the boundaries of #reuse β»οΈ and heavy lift rockets to extreme limitsβwhich is precisely what #SpaceX is trying to do with its fully reusable launch system https://arstechnica.com/science/2021/02/report-nasas-only-realistic-path-for-humans-on-mars-is-nuclear-propulsion