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Dark-rimmed crater and extensive "Ejecta Blanket"
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Caption NASA originale:"Mariner 10 took this picture (FDS 166840) from a distance of 63.400 Km (39.300 miles) about one hour after it passed under the South Pole of Mercury. The dark-rimmed crater at upper left is 67 Km (42 miles) in diameter. It is surrounded by an extensive ejecta blanket and exhibits a bright ray pattern, which extends into and beyond the larger crater (120 Km - or 75 miles) to its right and near the picture's center. The dark-rimmed crater is similar to crater Tycho on Earth's moon. The center of this picture is located 33° South Lat. and 158° West Long. North is to the top".
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(Dettagli)
