When we look up at the night sky, we are looking into the past. The light from distant stars takes millions of years to reach us. But if we could rewind that cosmic movie far enough—past the formation of Earth, past the birth of the first stars, past the very existence of atoms—we would eventually arrive at a single, incomprehensible moment: the beginning. This is the premise of the .
LEONARD: "Sheldon, for twenty years, I have deferred. But I'm going to say it: Batman is 'B,' not 'Ba-narrative.'" big bang theory
For decades, the main competitor was the , proposed by Fred Hoyle. It suggested that the universe is eternal and unchanging, with new matter created continuously as the universe expands to keep density constant. When we look up at the night sky,