2034 Earth–Venus–Mars opportunity looks promising. 10–15 on-orbit refueling operations may be needed to make a crewed ship full. (A version 4 Starship could refuel with five tanker launches. Most refueling can be done at an altitude of 180–200 km, made possible by Starship’s size. The final refueling may be performed at a higher altitude of ...

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Link :
https://www.nextbigfuture.com/2026/05/mars-venus-phobos-and-deimos-manned-flyby-mission-starting-2034.html