行星
火星
Mars
The red planet
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简介
Mars gets its colour from iron oxides in its dust. It hosts Olympus Mons, the tallest volcano in the Solar System, and Valles Marineris, a canyon system about 4,000 km long. Ancient river beds and lakes show that water once flowed on its surface.
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Mars has two small moons, Phobos and Deimos, probably captured asteroids.