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Besides Earth, Mars would be the easiest planet to live on. Mars has liquid water, a habitable temperature and a bit of an atmosphere that can help protect humans from cosmic and solar radiation. The gravity of Mars is 38% that of the Earth. The length of a Martian day is also very close to the length of an Earth day - lasting 24 hours, 39 minutes and 35 seconds – which would make human adaptation to Mars' day/night rhythm very simple.