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Mercury
Venus
Earth
Mars
Jupiter
Saturn
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| Photos of Mars |
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 Mars is the fourth planet. Mars has two polar ice caps. The one on the north pole is much smaller than the south pole one. The above picture shows Valles Marineris: a system of canyons 4000 km long and from 2 to 7 km deep. Mars has the largest volcano in the solar system, Olympus Mons. 
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