> in space Pretty much all space-faring SciFi, including "hard scifi", is basically garbage that you can toss out the window as far as expectations go. Think t

> in space Pretty much all space-faring SciFi, including "hard scifi", is basically garbage that you can toss out the window as far as expectations go. Think things are hard to cool on earth? Space leaves you with radiative cooling only. The least efficient (space x time x cost x performance) type of cooling in the known universe. Internally-powered propulsion in spacecraft is never going to happen with thermodynamics around.