Mars Mars is the fourth planet from our Sun, and the last of the inner planets. We live on the third, orbiting the Sun at a distance that maintains water oceans and conditions that have supported life for around four billion years. Mars is about half the size of Earth and has two moons, Phobos and Deimos. Its surface is red due to the oxidation of iron in the soil. The Martian atmosphere is 100 times …showed first 75 words of 501 total…

…showed last 75 words of 501 total…