Of the six outer planets, Mars, commonly called the Red Planet is the closest to Earth. Mars, 4200 miles in diameter and 55% of the size of Earth is 334,600,000 miles from Earth and 141,000,000 miles from the Sun. It takes this planet along with its two moons, Phobos and Deimos 183 years to circle the Sun, compared to 365 days for the Earth.
