"Worlds in Collision" is a landmark first edition, first printing hardcover book published in 1950 by Macmillan. It explores Immanuel Velikovsky's provocative and highly debated theories regarding cosmic history, planetary catastrophes, and their impact on ancient human civilizations. Written by Immanuel Velikovsky, a controversial psychoanalyst and researcher also known for influential subsequent works like Ages in Chaos and Earth in Upheaval. This vintage copy shows minor wear and fraying to the spine. Additionally, there are water marks on the inner front and back covers, as well as a previous owner's name written on the first few blank pages. Please see photos for close-ups of these condition details