Pluto is a planetoid (formerly designated planet) on the outermost borders of the Sol solar system.
Starship Troopers novelEdit
Carl was assigned to a laboratory on Pluto. He was later killed during a raid.
Roughnecks: Starship Troopers ChroniclesEdit
Pluto was used for research stations for SICON until Arachnids began appearing on the planet leading to The Pluto Campaign during which the researchers had to be evacuated.