Originally Posted by jane doe
I believe Hawking does not have a theory for gravity. Perhaps the Expanding Earth Theory would be better for mathematical equasions for gravity. This could explain the change of gravitational force's effects on size evolutions in species habitating this planet. The larger the mass, the greater the gravity, the smaller the species as mass increases.
Not a scientist, though.
Seeing as there already is a well founded explanation of gravity, why would Hawking have his own? And no, its not a change in gravity that affects the average size of creatures on Earth, but rather the amount of biomass in the ecosystem that is available.