Many things about Mars would remind a settler of Earth, but some things are quite different. Except for the lack of any vegetation, the sandy, rock-strewn landscape looks much like an earthly desert. Dust devils and blowing dust storms are often seen. A day on Mars is 24.6 hours, similar to Earth's day, so the circadian rhythm of a settler would not be upset. Mars's rotation axis is tilted at 25 degrees compared to Earth's 23.5 degrees, so Mars also has seasons. However, its year is nearly two Earth-years long because Mars is one and a half times farther from the Sun. Therefore, the seasons on Mars are much longer than Earth seasons. Martian gravity is only about four-tenths as great as gravity on Earth. A person weighing 60 kilograms (132 pounds) on Earth would weigh about 24 kilograms (53 pounds) on Mars.

The Moon, on the other hand...