DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Mayan ruins, part of the Mayan city of Chichen Itza in Yucatan, Mexico. A comet (upper centre) can be seen in the starry night sky. The Maya were an American Indian people, who established an advanced civilization. Chichen Itza was the cultural centre for a large settlement from the late 10th to the 13th century. The pillars and sculptures are part of an astronomical observatory, which was part of Mayan worship.
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