Immanuel Velikovsky (Russian: Иммануил Великовский Hebrew: עמנואל וליקובסקי, also Emmanuel Velikovsky) is best known as the author of a number of controversial books reinterpreting the events of ancient history, in particular the US bestseller Worlds in Collision, published in 1950. Earlier, he played a role in the founding of the Hebrew University of Jerusalem, and was a respected psychiatrist and psychoanalyst. 
His books use comparative mythology and ancient literary sources (including the Bible) to argue that Earth has suffered catastrophic close-contacts with other planets (principally Venus and Mars) in ancient times. Velikovsky argued that electromagnetic effects play an important role in celestial mechanics. He also proposed a revised chronology for ancient Egypt, Greece, Israel and other cultures of the ancient Near East. The revised chronology aimed at explaining the so-called "Dark Age" of the eastern Mediterranean (ca. 1100 – 750 BCE) and reconciling biblical history with mainstream archaeology and Egyptian chronology.  
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