Board Thread:Questions and Answers/@comment-25069771-20140616130529/@comment-1038387-20140616131447

Two things:


 * Ignore modern science. He was created as a white guy alien back in the thirties, with little regard for biology.
 * Krypton's not a prison planet. Nothing in the 75 years of Superman supports this conclusion. And contrary to your reasoning, they have developed means of space travel, in several different continuities - Silver Age, All-Star Superman, to name some. Additionally, Kryptonite isn't some sort of natural resource on Krypton that lies around making doing nothing, it was the radioactive remains of the planet that didn't exist before the planet exploded. How does this work? See point 1.