Ryujin
Legend
I was reading/collecting in the 1960s and 1970s, so I bear the Old KnowledgeInteresting. I've read quite a lot of Superman stuff from the late 1980s onwards and certainly have no memory of ever coming across that rather than "Earth's Yellow Sun", and also I know in quite a lot of it, Superman rapidly loses his strength and toughness when not receiving those "Yellow Sun" rays, which would mean that it literally couldn't be "primarily" due to being from a high-G planet in those cases. I guess a lot of people writing Superman for comics/TV/movies also have forgotten this? Like, in Lois Lane and Superman, they can imprison Superman and other Kryptonians in a downright flimsy-seeming jail just by basically having a "Red Sun" emitter and no daylight (no Kryptonite needed), but if they were primarily super-strong and tough/dense due to being high-G, that wouldn't work, you'd still need an incredibly tough super-jail.

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