What do you think are the most important factors in addition to the three mentioned? Oxygen availability? The possibility of producing food? Radiation? The possibility of developing other life forms (eg bacteria, man has a bacterial flora in itself, if there were no bacteria outside, it could significantly affect the human body in the long time perspective).
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For long-term settlement... Obviously breathable air would be great. Decent air pressure and temperature would make growing food easier, but nothing hits all those markers in our solar system. A magnetosphere to block radiation... I think we're just so perfectly adapted for the very specific conditions of our planet that it would be really difficult to find another planet that we're equally adapted to.