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Mars is a planet about half the size of Earth. Its surface contains abundant iron. Over time, this iron rusts, giving Mars its famous red appearance. For this reason, it is called the “Red Planet”. 🏞️ Features on Mars’ Surface Mars has mountains, canyons, and ancient riverbeds. The tallest mountain, Olympus Mons, is 2.5 times higher than Earth’s Mount Everest! The longest canyon, Valles Marineris, is exactly 4,800 kilometers long. Ice composed of carbon dioxide and water is found in the polar r