The Photonucleic Effect is the effect by which Kryptonians and creatures from the planet Krypton and, presumably, Daxam as well, are given incredible superpowers by exposure to Earth's Yellow sun. The Photonucleic Effect was first explained in Elliot S! Maggin's novella, Starwinds Howl. It was explained as follows: It has also been learned that blue stars have an even greater Photonucleic effect upon Kryptonians, granting them exponentially increased powers, as well as the additional power of Superman Vision.