What Came Before the Big Bang

The Big Bang describes how the universe expanded from an extremely hot, dense state, but it does not explain what, if anything, came before it. The Big Bang describes how the universe expanded from an extremely hot, dense state, but it does not explain what, if anything, came before it. This book examines the scientific theories that attempt to address that question, including inflation, cyclic models, quantum cosmology, and the multiverse hypothesis. You will learn how physicists approach the boundaries of current knowledge, what observational evidence exists, and where genuine scientific uncertainty remains. The book distinguishes established physics from speculative models and explains why some questions may lie beyond the reach of testable science. This is an AI-generated book, written to offer a clear, accessible introduction to one of cosmology's most difficult open problems, suitable for readers with no prior background in physics.