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Noctilucent Clouds in Motion, Curiosity Sol 2410 Curiosity looked upward after sunset on sol 2410 (18 May 2019) and saw wispy cirrus clouds in motion, high above the ground. Because of their high elevation, the clouds are still sunlit, making them noctilucent clouds. The animation was assembled from 3 sets of 3 Navcam images. NASA / JPL-Caltech / Justin Cowart