Justin Cowart is a geologist and amateur astronomer living in Carbondale, IL. Justin has had a lifelong interest in exploring space, and one of the most fun ways to satisfy that curiosity has been looking at the images returned by space missions. His interests lie in reprocessing old data (which looks surprisingly good when it's run through modern computers!) and finding aesthetically-pleasing images that may not have gotten noticed otherwise. He can be found on Twitter as @jccwrt, and on Flickr.
Curiosity looked upward after sunset on sol 2405 (13 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.