What Happened Before the Big Bang?
The question doesn't make sense if we posit that God sustains the universe from a 'location' outside of space and time.
It is often said that science cannot prove the existence of God. Yet science does have value in theological debate because it gives us new concepts that sometimes make popular notions of God untenable. One of these concerns the nature of time.
Many people envisage God as a sort of cosmic magician who existed for all eternity and then, at some moment in the past, created the universe in a gigantic supernatural act. Unfortunately, this scenario raises some awkward questions. What was God doing before he created the universe? If God is a perfect, unchanging being, what prompted him to act then rather than sooner?
The fifth-century theologian St. Augustine neatly solved the problem by proclaiming that the world was made with time and not in time. In other words, time itself is part of God's creation.
To make sense of Augustine's concept, it is necessary to place God outside of time altogether, and the notion of a timeless Deity became official church doctrine. However, it is not without its own difficulties. How can a timeless God be involved with temporal events in the universe, such as entering into human history through the Incarnation?
Today, religious people like to identify the creation with the Big Bang of scientific cosmology. So what can we say about the nature of time in the scientific picture?
Albert Einstein showed us that time and space are part of the physical world, just as much as matter and energy. Indeed, time can be manipulated in the laboratory. Dramatic time warps occur, for example, when subatomic particles are accelerated to near the speed of light. Black holes stretch time by an infinite amount. It is therefore wrong to think of time as simply "there," as a universal, eternal backdrop to existence. So a complete theory of the universe needs to explain not only how matter and energy came to exist, it must also explain the origin of time.
Happily, Einstein's theory of relativity is up to the job. It predicts a so-called "singularity" at which time abruptly starts. In the standard Big Bang scenario, time and space come into being spontaneously at such a singularity, along with matter.
People often ask, What happened before the Big Bang? The answer is, Nothing.
By this, I do not mean that there was a state of nothingness, pregnant with creative power. There was nothing before the Big Bang because there was no such epoch as "before." As Stephen Hawking has remarked, asking what happened before the Big Bang is rather like asking what lies north of the North Pole. The answer, once again, is nothing, not because there exists a mysterious Land of Nothing there but because there is no such place as north of the North Pole. Similarly, there is no such time as "before the Big Bang."