Fourth Rock From the Sun The fourth rock form the Sun is also known as Mars. Mars is a dead barren planet, but when the past comes alive anything is possible. It's believed that at one time on Mars a thick nitrogen atmosphere was present with fresh running water, but was that enough to su...

Mars, otherwise known as the "red planet", is approximately 227,940,000 km from the sun (Arnett 2000). It has two moons, Phobos and Deimos, which are believed to have been asteroids captured by the planet's gravity (Sheehan 220). Mars is the 4th closest planet to the sun and it ...