Previous Post Questions regarding how Superman's powers work and what role Krypton's gravity has on him rumble on eternally, writers still like to remind us that Krypton's high gravity plays a part in what he can do but never actually explain what it is that the gravity differential does for him... But check out one of the earliest Superman Origins and actually, it all makes a neat sort of sense: Now that's how it should be.

While I'm not one who absolutely needs to have Superman's powers come from gravitational differences, I will say that if it has to be implemented, this is probably the best way to do it. Have most of his physical attributes come from gravity, the rest of his powers be mental enhancements from solar energy.

Thanks for the find, Daveyem!