PPOD: While these two sunlit spheres share similarities in their shape and in being illuminated by the same star, they are vastly different. The one farthest away from the camera, hiding behind the clouds, is our own Moon, the Earth's only natural satellite. The other object is the dome of a telescope at ESO's La Silla Observatory, located on the outskirts of the Atacama Desert, in northern Chile. Credit: L. Sbordone/ESO

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