The ratio is actually a function of the radius: v = (4/3) * pi * r^3 s = 4 * pi * r^2 s / v => 3/r This makes a kind of sense in terms of heat transfer: the

The ratio is actually a function of the radius: v = (4/3) * pi * r^3 s = 4 * pi * r^2 s / v => 3/r This makes a kind of sense in terms of heat transfer: the sun's got a whole lot more insides for radiation to get through before it can even reach the surface to escape. EDIT: line breaks unbreak formulas.