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NASA's Lunar Reconnaissance Orbiter took this wide-angle photograph of Mare Nubium, a seemingly featureless expanse on the moon. The crater on the left is Bullialdus, which spans about 38 miles in diameter. (Image: NASA) NASA's Lunar Reconnaissance Orbiter took this wide-angle photograph of Mare Nubium, a seemingly featureless expanse on the moon. The crater on the left is Bullialdus, which spans about 38 miles in diameter.