Rana 3 is a Planetary Union farming colony.
"Rana three is a farming colony, they have no defenses."The Krill destroyer Yakar targets Rana 3 for an attack using a prototype weapon, the neutron field generator, theoretically capable of destroying all life on a continent within a matter of minutes. However, undercover Union officers Ed Mercer and Gordon Malloy successfully undermine their plans just as the Yakar enters Rana 3's orbit. Realizing that the Krill are extremely sensitive to ultraviolet radiation, Mercer and Malloy manipulate the ship's lights to produce a lethal level of brightness, wiping out the vast majority of the crew and saving Rana 3.
"An ideal site, yes." ― Ed Mercer and Teleya[source]
- Episode Six: Krill (mentioned only)