For those of you who saw the Death Battle, you know how powerful Superman can be. If not, link is above for you to find out. (skip to 8:46 for his stats)
But I've found a continuity error. If Kryptonians really are that powerful, then how come a measly planet implosion/explosion killed off most of their race? I understand that they lived under a Red Sun, but they were technologically advanced. Couldn't they have evacuated their population to a yellow star?
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Also do you not realise just how much money it would cost to move an entire population to another planet. And even if they had the money, by the time the planets end came to be, even if the planet accepted Jor's evidence, you think there would be a sufficient time to move an entire planet? Obviously not, I mean if the planet is so close to it's death that the evidence for it is "compelling" as you say, then there simply wouldn't be.