A question about superman: How can a species have evolved to have superpowers that require a type of star that this species did not evolve under?

As far as I know, these powers did not express themselves on their home planet, so they would have had no impact whatsoever on the survivability and competitiveness of an individual among the population, and as such would not have been subject to selective pressures that are a requirement for such a trait to become prevalent among the vast majority of that population.