| Vallis Alpes |
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| valleys on the moon | |
| alpes, vallis | |
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The valley floor is a flat, Lava -flooded surface that is bisected by a slender, cleft-like Rille . (This cleft is a challenging target for Telescope observation from the Earth .) The sides of the valley rise from the floor to the surrounding highland terrain, a blocky, irregular surface. The southern face of the valley is straighter than the northern side, which is slightly bowed and uneven. The more rugged edges of the valley lie at the narrow west-southwest end that cuts through the mountain range. Most likely this valley is a Graben that was subsequently flooded with magma. This valley was discovered in 1727 by Francesco Bianchini . |
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