Why Does the World Exist?

Physicist Steven Weinberg answered the question like this:

For me … it’s part of a larger question, which is ‘Why are things the way they are?’ That’s what we scientists try to find out, in terms of deep laws. We don’t yet have what I call a final theory. When we do, it might shed some light on the question of why there is anything at all. The laws of nature might dictate that there has to be something. For example, those laws might not allow for empty space as a stable state. But that wouldn’t take away the wonder. You’d still have to ask, ‘Why are the laws that way, rather than some other way?’ I think we’re permanently doomed to that sense of mystery. And I don’t think belief in God helps. I’ve said it before and I’ll repeat it. If by ‘God’ you have something definite in mind – a being that is loving, or jealous or whatever – then you’re faced with the question of why God’s that way and not another way. And if you don’t have anything very definite in mind when you talk about ‘God’ being behind the existence of the universe, then why even use the word? So I think religion doesn’t help. It’s part of the human tragedy: we’re faced with a mystery we can’t understand.