PARALLEL UNIVERSES 253
baby universes. "Survival of the fittest" simply means survival of the
universes that are most favorable to producing advanced civilizations.
If this picture is correct, it would explain why the fundamental
constants of the universe are "fine-tuned" to allow for life. It simply
means that universes with desirable fundamental constants compatible with life are the ones that proliferate in the multiverse.
(Although this "evolution of universes" idea is attractive because it
might be able to explain the anthropic principle problem, the difficulty
with this idea is that it is untestable and unfalsifiable. We will have to
wait until we have a complete theory of everything before we can make
sense out of this idea.)
Currently, our technology is far too primitive to reveal the presence of
these parallel universes. So all this would qualify as a Class II impossibility-impossible today, but not in violation of the laws of physics. On
a scale of thousands to millions of years, these speculations could become the basis of a new technology for a Type III civilization.