NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Apollo 8 photograph of the crater Cauchy, situated between two linear features: (1) Cauchy scarp (lower feature). A scarp is a relatively straight cliff-like face or slope separating terrain lying at different levels. And (2) Cauchy rille (upper feature). A rille is a trench-like valley. Apollo 8 was launched on 21 December, 1968.
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