Our universe could have popped into existence 13.7 billion years ago without any divine help whatsoever, researchers say.

That may run counter to our instincts, which recoil at the thought of something coming from nothing. But we shouldn't necessarily trust our instincts, for they were honed to help us survive on the African savannah 150,000 years ago, not understand the inner workings of the universe.

Instead, scientists say, we should trust the laws of physics.

"The Big Bang could've occurred as a result of just the laws of physics being there," said astrophysicist Alex Filippenko of the University of California, Berkeley. "With the laws of physics, you can get universes."

Filippenko spoke on June 23 at the SETICon 2 conference, during a panel discussion called "Did the Big Bang Require a Divine Spark?" [Images: Peering Back to the Big Bang]

Quantum Fluctuations

In the very weird world of quantum mechanics, which describes action on a subatomic scale, random fluctuations can produce matter and energy out of nothingness. And this can lead to very big things indeed, researchers say.

"Quantum mechanical fluctuations can produce the cosmos," said panelist Seth Shostak, a senior astronomer at the non-profit Search for Extraterrestrial Intelligence (SETI) Institute. "If you would just, in this room, just twist time and space the right way, you might create an entirely new universe. It's not clear you could get into that universe, but you would create it."

"So it could be that this universe is merely the science fair project of a kid in another universe," Shostak added. "I don't know how that affects your theological leanings, but it is something to consider."

Filippenko stressed that such statements are not attacks on the existence of God. Saying the Big Bang — a massive expansion 13.7 billion years ago that blew space up like a gigantic balloon — could have occurred without God is a far cry from saying that God doesn't exist, he said.

"I don't think you can use science to either prove or disprove the existence of God," Filippenko said.

The Origin of the Laws of Physics

If we're after the ultimate origin of everything, however, invoking the laws of physics doesn't quite do the trick. It may get us one step closer, but it doesn't take us all the way, Filippenko said.

"The question, then, is, 'Why are there laws of physics?'" he said. "And you could say, 'Well, that required a divine creator, who created these laws of physics and the spark that led from the laws of physics to these universes, maybe more than one.'"

But that answer just continues to kick the can down the road, because you still need to explain where the divine creator came from. The process leads to a never-ending chain that always leaves you short of the ultimate answer, Filippenko said.

The origin of the laws of physics remains a mystery for now, he added, one that we may never be able to solve.

"The 'divine spark' was whatever produced the laws of physics," Filippenko said. "And I don't know what produced that divine spark. So let's just leave it at the laws of physics."

Image courtesy of NASA/WMAP

This article originally published at Space.com here