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Petroglyphs and La Silla observatory. View across ancient rock art towards the Moon shining brightly in the night sky over the La Silla observatory in the southern Atacama Desert, Chile. This site is operated by the European Southern Observatory (ESO). La Silla was ESO's first observing site and is still one of the leading observatories in the southern hemisphere. (KEYSTONE/SCIENCE PHOTO LIBRARY/BABAK TAFRESHI, TWAN/SCIENCE PHOTO LIBRARY)