Video narration
Is the Big Bang an explosion into empty space? Think of raisins in rising bread dough: as the dough stretches, the raisins move farther apart. But that's only a quick comparison; the universe isn't dough expanding into a room. The universe was once far hotter and denser than it is now. As space expanded, it cooled, and matter eventually formed the structures we see. Here's the key flip: space itself expanded. Nothing was blasted outward through pre-existing empty space. We have evidence: light from distant galaxies arrives stretched, and the sky holds a faint glow left from the universe's hotter past. Together, those clues point to space growing while the universe cooled. So, was it an explosion into empty space? No. The Big Bang says the universe was once hot and dense, and space has expanded and cooled ever since.