The explanation for Superman’s powers are one of the more simple ones in comics. He’s an alien from the planet Krypton and that’s why he is super strong, can fly and shoot lasers out of his eyes. Fair enough. You can’t really argue these facts as we don’t know anything about the alien physiology. Where things start to fall apart though is the suggestion that Kryptonians are solar powered – specifically under a yellow sun. The problem with this is that the planet Krypton has a red sun. My question is “how on
earth Krypton did Kryptonians
evolve to have super powers under a yellow sun?”.
It doesn’t really make any sense how Kryptonians accidentally acquired all these amazing abilities with no selection pressure whatsoever. There's no advantage to be had from being able to fly in a different star system. I think what’s more likely to have happened is one of the following;
A) Kryptonians used to have a yellow sun (and it’s turned red over millions of years)
B) Kryptonians actually came from another planet with a yellow sun before moving to Krypton.
In both of these scenarios it’s possible to envisage how Kryptonians could have evolved to have all these amazing powers as there’s clearly a strong selective advantage to being super strong, flying etc. I’m guessing Kryptonians have some super efficient form of photosynthesis which uses yellow light to power all their amazing abilities.
The only remaining question is how long have Kryptonians existed without a yellow sun? If it was millions of years it could well mean that mutations could have occurred causing the loss of powers as there’d be no reason to select against it. Much like our appendix would there be any reason to keep the power of flight, and laser eyes if they no longer work. Unless of course the biological pathways required for superpowers are intrinsically linked with basic Kryptonian biology eg whatever gives them laser eyes is also required for sight - meaning there is a selective pressure to keep it. Maybe Superman is just a really lucky Kryptonian who never lost any of his latent powers? what if Superman has lost some of his powers and other Kryptonians may have even more powers? That sounds like an idea for a new villain for him.