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SlideshowReport

Major Impacts on Mercury and on Our Moon

Description
(c) Unusual, Hilly Terrain. What look like tiny,
fine-grained wrinkles on this picture are actually closely spaced
hills, part of a jumbled terrain that covers nearly 500,000 square
km on the opposite side of Mercury from the Caloris Basin. The
large, smooth-floored crater, Petrarch, has a diameter of 170
km (106 mi). This impact crater was produced more recently
than Caloris Basin
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