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First, I think these questions are brilliant. When he formulated them no one knew whether the universe had a beginning or not. Today, we know that the universe is 13.8 billion years old, but I still think his questions are worth contemplating. For example, we do not know whether our universe is all there is, or whether there is a larger reality of which our universe is a small part. Could it still be that the universe (or larger reality) has existed forever?