Surrounded aby controversy even before its publication in 1950, Immanuel Velikovsky's Worlds in Collision introduced the provocative theory that Venus began as a brilliant comet ejected by Jupiter around 1600 BCE, wreaking chaos on Mars and Earth as it roamed through our solar system prior to settling into its current orbit. Immediately dismissed without any investigation and subject to vicious attacks, Velikovsky's theory is now poised for reexamination in light of recent astronomical and archaeological findings. Exploring the key points of Velikovsky's theories, Laird Scranton presents evidence from recent space probe missions and offers scientific explanations for many disputed aspects of Velikovsky's theories, such as how Venus transformed from a comet into an orbiting planet. By updating this unresolved controversy with new scientific evidence, Scranton helps us to understand how it was that Worlds in Collision was the one book found open on Albert Einstein's desk at the time of his death.