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.
Understanding the Context
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). A view of the surface of mars shows an unusual feature — a seemingly square crater bounded on three sides. Please see the explanation for more detailed information.
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