Re: Approx size of Hazrat Adam A.S
So we know that
g=Gm/r^2
where capital G is a universal constant. So for g (gravity) to be less, either mass should be less or radius should be more. IT is possible that when earth was in molten form, its radius was more. But we are talking about existence of life era, for which, earth needed to be in solid form with water and oxygen around (as we have it now).
It just does not make common sense that earth, after solidifying and having atmosphere and water, kept changing its size or mass.
Take example of moon. For moon to have 83 % of earth’s gravity, it had to have 1/4th of earth’s size. Also, just 17% loss in gravity made moon unable to hold oxygen for the life to survive. So if earth had any less gravity, first it mass had to be much lesser than current, plus earth would not have any atmosphere which eliminated any giants or non-giants to survive anyways. SO the fact that animals were living (giants) means that earth had same gravity and mass