Colonization of Mars
The surface gravity on Mars is 38% of that on Earth. It is unknown if this is enough for human health. Mars is much colder than Earth. Mars surface temperature is −63 °C and a low of −140 °C. The lowest temperature ever recorded on Earth was −89.2 °C, in Antarctica. There is no liquid water on the surface of Mars. Because Mars is further from the Sun, less solar energy reaches the upper atmosphere of Mars. Mars' orbit is more eccentric than Earth's.