and on a lighter note
For our purposes, all forms of kryptonite are available in unlimited quantities. It has been estimated, from the startling tonnage of kryptonite fallen to Earth since the explosion of Krypton, that the planet must have outweighed our entire solar system. Doubtless the “planet” Krypton was a cooling black dwarf star, one of a binary pair, the other member being a red giant.
From Man of Steel, Woman of Kleenex by Larry Niven. Prompted by George‘s talk of superheroes and the later comment about fantasies, so it’s all his fault.