"Worlds in Collision" is a book written by the American author and researcher Immanuel Velikovsky in 1950. The work presents a controversial theory that suggests catastrophic events in the past, such as planetary collisions and near-misses, have shaped human history and mythology. Velikovsky argues that these events involved celestial bodies like Venus and Mars, which he claims had close encounters with Earth. The book challenges traditional scientific views, particularly in the fields of astronomy and geology. Velikovsky's ideas sparked significant debate and criticism, leading to discussions about the relationship between science and mythology. Despite the controversy, "Worlds in Collision" gained a wide readership and remains a notable work in the realm of alternative history.