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| Every old, solid surface in the solar system is scarred by craters. (b) The surface of Mercury as photographed by a passing spacecraft shows vast numbers of overlapping craters. |
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| Every old, solid surface in the solar system is scarred by craters. (b) The surface of Mercury as photographed by a passing spacecraft shows vast numbers of overlapping craters. |
Throughout the solar system, the heavy bombardment cratered all the solid worlds as the last of the debris in the solar nebula was swept up.