A rocky planet the planets closest to the sun—mars, earth, venus, and mercury—are made mostly of rock. The rocky planets all formed in our inner solar system. Their geological history.

Scientists are uncovering how mars transformed into the cold, dry desert world it is today. Nasa's real-time portal for mars exploration, featuring the latest news, images, and discoveries from the red planet. In 1971 mariner 9 entered orbit around mars, being the first spacecraft to orbit any body other than the moon, sun or earth; Following in the same year were the first uncontrolled impact (mars 2).

Mars | Facts, Surface, Moons, Temperature, & Atmosphere | Britannica

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