Big Bang Explained in 20 Seconds | How the Universe Began | Big Bang Theory

About 13.8 billion years ago, the Big Bang marked the beginning of our universe. The universe was once extremely hot and dense, then it began expanding — and it is still expanding today. Imagine inflating a balloon: Each dot represents a galaxy, and as the balloon expands, every galaxy moves away from every other galaxy. This short video explains: What is the Big Bang Theory How universe expansion works Why galaxies are moving apart Ideal for viewers interested in space, cosmology, and science shorts. #BigBang #Universe #SpaceFacts #Cosmology #ScienceShorts