Re: Is there an astrophysicist in the house?
Keep in mind that Hyperborea only exists as it does because of the Great Obelisks. It's more like a space station than a planet. Based purely on its size, it shouldn't have Earth gravity or be able to hold its atmosphere, not to mention the weirdness with the waters that spill over the side somehow being recycled. Astrophysics doesn't really come into it.
"The fear of death, its risk each time, is one of the most stimulating parts of the game. It therefore behooves the referee to include as many mystifying and dangerous areas as is consistent with a reasonable chance for survival." - J. Eric Holmes