Astronomy
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…our solar system. Valles Marinoris is a huge canyon on Mars that adds to the crater impression on the surface caused by many meteor impacts. The atmosphere on Mars is mostly carbon dioxide and it contains a troposphere, which rises to an altitude of about 30 km. It occasionally contains clouds of water and ice above the troposphere, which is called the stratosphere. Mars is also a planet with no detection of a magnetic field present.
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