Autistic DM (he/him)
A bit off topic, but this reminds me of a really bad (at least dumb) Doctor Who episode that I saw awhile back. It had basically the same concept, but with the moon.I kept thinking and imagined what if all planets are in fact cosmic dragon eggs, The eggs incubate for 10 billion years until the dragon is born in a fiery explosion of new magic.
Earth quakes are caused each time the Baby dragon moves, and perhaps there are cults dedicated to keeping the dragon asleep and never hatching
Not saying it's a bad idea for D&D, though. I just thought it was dumb in the TV show.
Hmm. . .
Maybe the Crystal Spheres are actually the eggs? The Sun could be the "yolk" of the "egg".