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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.
This article is part of the NASA Knows! (Grades 5-8) series. Mars is the fourth planet from the sun and the next planet beyond Earth. It is, on average, more than 142 million miles from the sun. Mars is about one-sixth the size of Earth. Mars is known as the Red Planet. It gets its red color from the iron oxide (like rust) in its soil.