Velikovsky’s Worlds in Collision, a book which asserts, among many other things, that the planet Venus did not exist until recently. Some 3500 years ago in the guise of a gigantic comet, it grazed Earth a couple of times, after having been ejected from the planet Jupiter some indefinite time earlier, before settling into its current orbit. Velikovsky (1895-1979), a psychiatrist by training, did not base his claims on astronomical evidence and scientific inference or argument. Instead, he argued on the basis of ancient cosmological myths from places as disparate as India and China, Greece and Rome, Assyria and Sumer.