Mars has water, frozen underground and at the polar caps. There is evidence that this water has, in the past and present, flooded the surface in liquid form. Signs of erosion can be found on the slopes of craters and volcanoes. Geological features resembling those on Earth suggest that Mars was once a wet and hospitable planet.
A day on Mars is 24.5 hours long. Mars is a third the size of Earth, but it has as much land area as the seven continents combined. Its gravity is 2.7 times less than that of Earth: enough to remain flat-footed on the surface, but a low enough escape velocity to make launching from Mars relatively simple. Remember, it was much easier for Apollo to lift off from the moon than it was to leave Earth. Construction materials would be lighter as well, facilitating labor in the early colony. The health benefits of such an environment are unknown, but it is theorized that Mars might prevent and relieve forms of arthritis and back pain. Also, Martian-born children might be taller than their Terran cousins.
Both planets have seasons and similar rotational patterns. Mars is roughly in the same heat-range as Earth, being next-door in the solar system, and if it had a thicker atmosphere it is likely the two planets would share the same climate. Today, Mars's temperature varies from +1°F to -178°F, with an average global temperature of -85°F. That's cold, but still the solar system's most hospitable for humans
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