Everything we know—every planet, star, and galaxy—came from a single moment: the Big Bang. In an instant, the universe was born from nothing, expanding into the vast cosmos we live in today. But how does something emerge from nothing? What triggered this event? And if there was truly nothing before the Big Bang, what does that even mean? Was there an empty void waiting for the universe to appear? Or was "nothing" a state so bizarre that our understanding of physics simply can’t explain it? Some theories suggest that the Big Bang wasn’t the beginning at all—that something existed before it. From quantum fluctuations and extra dimensions to bubbling multiverses and bouncing universes, let’s explore ideas about what may have sparked everything into existence.