Search results

Maybe at some point. Originally, Krypton was just a high-gravity planet, then the red sun thing came about. I wouldn't be surprised if that phrase has been used to explain some of Superman's powers at least once.

Also, I believe something was supposed to have happened to the Kryptonite between Krypton and Earth - that the forces destroying the planet had infused it with some radioactive properties, much like Red K was said to be Green K which had passed through some sort of ionizing storm.