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there are populous galaxies with multiple inhabited planets, to the single planet galaxies

-.-.Expansion 6 (X6) Federet
2 3-planet galaxies rich in heavy metal and stone resources, semi-recently inhabited
incl. Genoe (livestock ag), Genesee (hardstone, stone, precious gems), Geris (crude ores, rare elements) – 3Gs of the Demetrion Galaxy

-.-.Transitnet Archipelago Federet (from different expansions)
isolated planets/galaxies that were initially uninhabited, and subsequently colonized – no propinquity, main connection to the Imperium is via transportation technology

-.-.Aquari Home Federet
has the 8+ planets they had already colonized/inhabited before Humans made contact

For more on the Pan-Galactic Imperium, see below to Government/Society/History