The question should be 'How can something come out of nothing' not 'Why cannot something come out of nothing'. Stephen Hawkings has recently argued as to how the universe can come out of nothing, but to my mind his argument is rather circular and it's not provable. 'Nothing' might be a result of 'something'.

Understanding the Context

There was always 'something' but this 'something' is not always the same. Sometimes it changes in to 'something' else. This means that the 'something else' is proceeded by its own nothingness You can project this little theory on to our own brain: The concept of 'nothingness' which is fabricated by the brain is nothing more than a result of the fact ...