The beginning of the universe is often imagined as a violent explosion, a flash of light rushing outward into preexisting darkness. This familiar picture contains a fundamental misunderstanding. The event we call the Big Bang was not an explosion in space, but the rapid expansion of space itself. This episode traces the story of the cosmos from an unimaginably dense and hot singularity to the formation of the first atoms, explaining how the universe grew from smaller than a proton to a vast expanse in a fraction of a second.

The narrative explores the strange physics of the Planck Era, where the four fundamental forces of nature were unified into a single interaction. It examines the epoch of cosmic inflation, a period of exponential growth that stretched quantum fluctuations into the seeds of galaxies. As the universe expanded and cooled,  ...