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The simple reason behind Marsâs reddish appearance is the layer of iron oxide dust covering the planetâs surface. Fine particles of various oxides of iron (hematite) and trace amounts of some elements like chlorine and sulfur on the Marâs surface is the main reason for its reddish color.
Trending Now. Answers. Best Answer: Mars is the fourth planet from the Sun in the Solar System. The planet is named after Mars, the Roman god of war. It is also referred to as the Red Planet because of its reddish appearance, due to Fe2O3, iron(III) oxide, (hematite) prevalent on its surface or rust as it's more commonly known. Source(s):