I've watched a TV series on a group of people that build a community on our neighboring planet, Mars, and after watching it, I started to wonder:

Could something like this really happen in the near future?

Are any of Sol's (our sun) rocky planets actually inhabitable?

  • $\begingroup$ Excluding Earth, you mean? $\endgroup$
    – F1Krazy
    Commented Feb 2, 2018 at 17:50
  • $\begingroup$ yes excluding earth. $\endgroup$
    – Imtherealsanic
    Commented Feb 2, 2018 at 17:50
  • 1
    $\begingroup$ None of the planets in our solar system could sustain unsupported human life in their current states. However mars, as well as several moons, all have to potential to support human colonies aided with technology, or even be terraformed to make it possible to live there unassisted. $\endgroup$
    – ScienceKeanu
    Commented Feb 2, 2018 at 17:53
  • $\begingroup$ Hi Imtherealsanic, and welcome. You seem to be asking about the real world, while on Worldbuilding, we're concerned with the construction of fictional worlds for use e.g. in storytelling, role-playing games, computer games, and the like. I'm going to migrate this to our sister site Space Exploration, where they are more likely to give you good answers about our real-world solar system. You may also want to check out Astronomy. Enjoy your stay! $\endgroup$
    – user
    Commented Feb 2, 2018 at 17:56
  • $\begingroup$ The surface temperature and pressure of Venus are much too high for beeing habitable. The surface temperature of Mercury is too cold at night and too hot at day. The gas planets like Saturn, Jupiter; Neptun and Uranus have no surface to habit. $\endgroup$
    – Uwe
    Commented Feb 2, 2018 at 18:12

2 Answers 2


No planets besides Earth have air that we can breathe, so in that sense, no other planets are inhabitable.

Of the eight planets, only Mars, Earth, Venus, and Mercury have a surface you could stand on.

Only Mars and Earth have surface temperatures low enough that a habitat could be built there with current technology.

But such a habitat could indeed be built on Mars. If, right now, advanced aliens made it easy for us to travel to Mars but gave us no help in surviving there, it would be easy enough to build a pressurized habitat that people could live in, with regular restocking of supplies.

Making such a habitat self-contained would require substantial research and development. The atmosphere is very thin and almost all carbon dioxide. The soil is not hospitable for growing crops. No particular obstacle seems insuperable, but an entirely self-contained habitat, even starting with Earth soil, has not been successfully created on a human-livable scale. (Biosphere 2 was a famous attempt.)


If you don't care too much about the rocky part there's always Venus. There is some very cool cloud city potential here if you can deal with the hurricane force winds.


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