“The universe, the real universe, might actually be much, much larger than the part we see today, because the velocity of light is finite and therefore we cannot look infinitely far. By looking into the sky with a telescope, we can only see as far as light can have travelled since the beginning of the universe…. it could be that the real universe is an extremely large domain, and that what we are seeing now is perhaps what has been started by some disastrous experiment performed some twenty billion years ago by a post-graduate student in order to test the structure of a vacuum of another universe. Then what happened was that the vacuum was suddenly changed, and the result is our universe.” – Johann Rafelski and Berndt Müller, The Structured Vacuum: Thinking About Nothing