Outworlds

noun plural
Collective term for all the worlds of the Fringe; those fourteen human colonies between the Tempter’s Veil and the Great Black Sea.
Source
Dying Of The Light

Xenonaut

noun
  1. (plural proper) An international organisation defending Earth from extraterrestrial invasion.
  2. A member of the Xenonauts defence force.
Origin
Derived from ksenos (foreign) and nautēs (traveller).
Source
Xenonauts