Not actually a fail; this post would better be titled, "Cosmological observation."
Being a reader of both science fiction and fantasy, it's always bothered me that the two genres more or less ignore each other. Fantasy hates technology; science fiction hates fun.
Alright, you know I'm only foolin'. Actually, what I've really noticed is that fantasy worlds tend to presuppose a cosmology identical to our own: stars, moons, planets, tides, yadda yadda yadda. You can infer this from the varying climes experienced in standard north-equator-south configurations, the constellations viewed in prophecy, and et cetera.
This... really bothers me. But for very specific reasons. Namely: fantasy tends to take place in worlds that are aeon-ancient. That's cool; but why isn't the Dragon Reborn fighting Bugs ands Skinnies, if the world is so dang old?
Of course, this argument is no more interesting than the absurdity that the millenia-old worlds of many fantasy settings are populated by people who manipulate iron but not bituminous coal - who can, say, penetrate the habitats of wild magical powers but not take advantage of the basic physical states of the mundane realm.
What is more weird is that I've never read any fantasy that takes place in a fundamentally different universe - a "truly fantastical" universe, if I'm inclined to play the jerk card. I scribbled down an idea last night for a world without astral bodies - a "plane" type world, which will be interesting to write if only because everyone will be blind and, I guess, really cold.
But I've got to know: are there any cosmologically vivacious fantasies out there? Come on, people, rally to the cause of Ben's reading list!
P.S. I wrote this entire post having confused "cosmology" and "cosmogony" (making this a vocabulary fail). I'm pretty upset that I didn't get to use the word "cosmogony" in the main body, so I'm just throwing in this post-script to write cosmogony a few more times.