The laws of physics
appear “fine tuned” for our existence.
Even slight deviations in the laws would result
in a universe devoid of stars and life. If, for instance,
the force of gravity were just a few per cent weaker it could
not squeeze and heat the matter inside stars to the millions of
degrees necessary to trigger sunlight-generating nuclear reactions.
If gravity were only a few per cent stronger, however, it would
heat up stars, causing them to consume their fuel faster.
They would not exist for the billions of years
needed for evolution to produce
intelligence. This kind
of fine tuning is
widespread.