They seem to understand that the yellow sun SHOULD be giving them powers. And it has been established throughout the show that Earth was well known to the Kryptonians (they have even had long term diplomatic relations with Mars). Just because Clark didn’t know about all the different Kryptonites from the get go doesn’t mean that it wasn’t in the common knowledge base of Krypton.
Is that mentioned in the show? It may be canon in the books (I do t read the comics, so I honestly don’t know), but it isn’t necessarily true on the show.
It says it came from Krypton, but it doesn’t say anything about it only gaining its properties after the destruction of Krypton.
No.
Valid theory. At least as valid as my theory. But I don’t see where it is established that that is where it gets its special properties from.
No. The Kryptonian Star is a red star. Therefore the material is inert. It doesnt gain it’s “magical” properties until it reacts with the radiation from a yellow star (such as Sol)
Again, just because Kryptonite didn’t exist “naturally” on Earth until ‘89 Doesn’t mean that Kryptonians were ignorant about its properties before then. Krypton had been a space faring world for centuries by the time it blew up. I think it is more likely that they discovered its properties when in the vicinity of a yellow star than assuming they hadn’t. Again, they had a long history in the Sol System with their political relationship with Martians and their visitations on Earth.
