People have wrestled with the mystery of why the universe exists for thousands of years. Pretty much every ancient culture came up with its own creation story – most of them leaving the matter in the hands of the gods – and philosophers have written reams on the subject. But science has had little to say about this ultimate question.
However, in recent years a few physicists and cosmologists have started to tackle it. They point out that we now have an understanding of the history of the universe, and of the physical laws that describe how it works. That information, they say, should give us a clue about how and why the cosmos exists.
Their admittedly controversial answer is that the entire universe, from the fireball of the Big Bang to the star-studded cosmos we now inhabit, popped into existence from nothing at all. It had to happen, they say, because “nothing” is inherently unstable.
This idea may sound bizarre, or just another fanciful creation story. But the physicists argue that it follows naturally from science’s two most powerful and successful theories: quantum mechanics and general relativity.