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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.
All things being equal, sunlight on Mars at aphelion would be about 36% as strong as sunlight on Earth. But Mars has a thinner atmosphere, so this will brighten it a little. Because your eyes adapt to the available light, the difference would be less noticable.