The followingoutline is provided as an overview of and topical guide to Mars:
Mars – fourthplanet from theSun and the second-smallest planet in theSolar System, afterMercury. Named after theRoman god of war, it is often referred to as the "Red Planet"[1][2] because theiron oxide prevalent on its surface gives it areddish appearance. Mars is aterrestrial planet with a thinatmosphere, having surface features reminiscent both of theimpact craters of theMoon and the valleys, deserts, andpolar ice caps ofEarth.
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