Can we even ask the question about what comes before the big bang and hope for a scientific answer? We can see light from the universe that took about 14 billion years to reach us, but that doesn't mean we see the beginning. If it took that light so long to reach us, then we cannot say definitively whether or not there is light that is 15 billion years old which has not yet reached us. We don't even know the shape of the universe or where we are in that shape. Are we in the middle? On the edge? Is there even an edge? I doubt we will ever be able to answer these questions. I'd say the only answer we could really give to the question of "What came before the big bang?" is "I don't know."
Can we even ask the question about what comes before the big bang and hope for a scientific answer? We can see light from the universe that took about 14 billion years to reach us, but that doesn't mean we see the beginning. If it took that light so long to reach us, then we cannot say definitively whether or not there is light that is 15 billion years old which has not yet reached us. We don't even know the shape of the universe or where we are in that shape. Are we in the middle? On the edge? Is there even an edge? I doubt we will ever be able to answer these questions. I'd say the only answer we could really give to the question of "What came before the big bang?" is "I don't know."