This is a experiment inspired by this map (https://www.deviantart.com/thobewill/art/The-Centauri-Highway-738041408)
The World of Nyx
Nyx are a rogue Ice Giant lying 1,7 light years from the sun toward Barnard's Star, it was discovered in 2067 CE. When humanity expanded into the Oort Cloud it became one of the first colnisation target and human ships arrived around the rogue planet in 4511 CE. They had already discover that Nyx had several moons,but some surprising discovery was found. Nyx had five moons: Hypnos, Hecate, Morpheus, Asteria and Phantasos. Hypnos and Phantasos was both Earth size, while Hecate was Mars size, Morpheus and Asteria was the size of the Moon. The was likely more moon earlier, but Phantasos was a captured rogue planet, which had thrown any other moons out of the lunar system. The three inner moons was all frozen with no atmosphere, Hypnos had the least water and had some dry land, while Hecate and Morpheus was had a deep ocean, Astria are a twin to Titan. Phantasos on the other hand was unique, it was a cold version of Venus weith a very thick atmosphere and a sea level pressure of 80 bars. Together with its very active vulcanism, this result in a surface temperature of 9 degree celcius. This was a incredible discovery and while the planet was lifeless, humanity have introduced a modified biosphere on the planet, this biosphere depend mostly on chemosynthesis and kinosynthesis for energy.
Moons
Hypnos: While less interesting than Phantasos, Hypnos are the centre of Nyx, home to 1,8 billion people, it's the second biggest human settlement outside Sol. The population live underground in a vast number of cavern, which areas are slightly bigger than Australia.
Hecate and Morpheus: Both are lightly populated, only 12 and 7 million lives on each. They live between the water and surface in cities in the ice. Not a lot difference between the world. Both use O'Neils Cones to ensure 1G.
Astria: home to 171 million people, Astria are in many ways the industrial powerhouse of Nyx, the population mostly live in floating cone shaped cities.
Phantasos: Home to 981 million people these vast number of people dwell in floating cities, these are the more traditional flying cities in the cold upper atmosphere, and mostly they mine the atmosphere for raw materials.
Other signifcant sight in Nyx lunar system:
Nyx itself are home to vast gas extrating industries, and around 150.000 people dwell in its atmosphere. These people mostly live here withot family a few month until they can return with a fat pay check.
Patel Station home to the local lightway station, here Lightway vessels arrive several times a year.
Hanseniv Yard, the biggest shipyards outside Sol, their ships are exported to other settlements in the region between the Oort Cloud of Sol and Barnard
Reposted from the map thread