History and specifics
Heavy gravity combined with a hot, thick atmosphere to make Kappa Rho IV inhospitable. It had low iron and mineral resources. Surface features included valleys and rolling hills, and its gray, rocky soil supported sparse green-gray and purple colored vegetation such as thornbush and possibly some types of fruits or vegetables. Animal life included large, ferocious whatever-snakes and benign armored beetles. Its weather patterns included sandstorms, and its red giant star lent a red cast to everything on the surface.
In 2277, two landing parties from the starship USS Enterprise made a preliminary survey for the Federation. Pavel Chekov's team collected air, plant, and insect specimens, while Lex Nakashima's team visited the opposite hemisphere. Both teams rejected Kappa Rho IV as a colonial prospect, with uncomfortably high gravity and the possibility that the highly-dangerous whatever-snakes could be intelligent. (TOS - Star Trek II Short Stories short story: "Intelligence Test")