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All About Planets By George & Harry Mars Mars is also often described as the “Red Planet” due to its reddish appearance. Mars is a terrestrial planet with a thin atmosphere composed primarily of carbon dioxide. Mars is the fourth planet from the sun and is the second smallest planet in the solar system. Named after the Roman god of war. Jupiter Jupiter is the biggest planet in the solar system. The planet Jupiter is the fifth planet out from the sun, and is two and a half times more massive than all the other planets in the solar system combined Mercury Mercury is the closest planet to the sun and due to its proximity it is not easily seen except during twilight