Gravity on Saturn's moon Titan is much weaker and the atmosphere is far denser than either Earth's or Mars's, which Starship seems to have been designed for. Could an unmanned starship do an Earth-Titan (and return?) tour nonetheless? Coming from interplanetary transit orbit, braking in Titan's atmosphere is probably much harder than in Mars's. Also, maximum aerodynamic pressure (Q-max) during restart might be more than in Earth's. On the plus side, one of the propellant components (liquid methane) is readily available on the surface, changing mass calculations.

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    $\begingroup$ Glad you said "unmanned." That would be a long voyage! $\endgroup$ – Camille Goudeseune Oct 2 '19 at 23:31
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    $\begingroup$ Methane is a rocket fuel that's burned stoichiometrically, so the mass savings may not be as great as you think. Oxygen is required in a 4:1 ratio. $\endgroup$ – SE - stop firing the good guys Oct 2 '19 at 23:59
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    $\begingroup$ @CamilleGoudeseune Well, with only one or two guys on board there is a lot of fuel capacity left. New Horizons took two years for that distance. Braking and returning is a bit of a problem though. $\endgroup$ – HannesH Oct 3 '19 at 0:00
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    $\begingroup$ @Hohmannfan There is water-ice as well. Energy for electrolysis might be a problem though. $\endgroup$ – HannesH Oct 3 '19 at 0:03
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    $\begingroup$ @HannesH In long-term confinement humans are less stable than Kerbals. $\endgroup$ – Camille Goudeseune Oct 3 '19 at 1:45

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