The Good Moons are three inhabited moons of Carlisle (New Europa VII), a large Saturn-like gas giant with extensive rings. They are 2 (Sirona), 3 (Damara) and 4 (Rosmerta). There are two other large moons, which are not inhabited, but are mined with robots in some cases.
Physical Planetography
Sirona is a rocky moon with substantial volcanism driven by tidal heating, and a modest atmosphere, which is mildly poisonous and not breathable. Pressure suits are not required, given adaptation. Mineral resources are abundant and the surface is geologically quite young. The surface has abundant colorful metal sulfides. The planet is rich in metals and silicates.
Damara is rocky moon with only a trace atmosphere. It is has a subsurface liquid water ocean and relatively thin crust.
Rosmerta is a large moon with a fairly thick hydrocarbon-rich reducing atmosphere. Pressures and temperatures are comfortable, however; it might be compared to a "warm Titan."
History and Culture
Sirona: Population 480M. Extensively colonized with oxygen-atmosphere tensile structures, many movable.
Damara: Population 290M. Colonization is mostly of the ocean, or tunnels melted in the ice above.
Rosmerta: Population 660M. Colonized with an Imperial-era worldhouse, the maintenance of which was a cultural preoccupation during the Dark Age. It has a single government.
The constituent states of the Good Moons form the Arthurian League, which is a member state of the Allied Worlds, and closely allied with Heidelberg.
The moons are named after fertility goddesses.
Economy
Economy is varied and well-developed, with extensive intrasystem trade. The Heidelberg-Rosmerta Chemical Corporation is the Allied Worlds' largest organic chemical corporation.