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  Universe TodaySpace and astronomy news Login Login Home Members Guide to Space Carnival Photos Videos Forum Contact Privacy The Planet Mars. Image credit: NASA Guide to Space, Mars The Planet Mars Article Updated: 3 Oct , 2016 by Matt Williams Mars, otherwise known as the “Red Planet”, is the fourth

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Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System , after Mercury . Named after the Roman god of war , it is often referred to as the Red Planet because the iron oxide prevalent on its surface gives it a reddish appearance . Mars is a terrestrial planet with a thin atmosphere , h