If you really want to “get somewhere,” space travel is not only possible, it’s mandatory.
On this one planet, the older and more complex a system becomes, the more likely are the inhabitants to direct their energies to the system, rather than its original purpose.
One guy used to like to mutter, “At least keep your dialogue from becoming a monologue.”
Over in this other world, no matter how the matches are listed, almost everyone ends up wrestling an uncertain opponent.
In most parts of this system, creatures need some kind of special insulation from their environment. And on Earth, they certainly have it.