The world of Ice once had another name, but it has been long forgotten. The locals call their world “ice” in their local tongues, in the same way as ancient humans called their world “earth”.
The original colonizers of Ice found a world on the brink of severe glaciation due to the cyclic cooling of its star. They built their cities and attempted to slow the coming ice age as best they could, and in most ways simply failed. Two sub-societies formed among the colonists. One seeking to armor themselves against the winter and outlast it. The other seeking to change themselves to survive on the new harsher world, and to change what other life they could to survive with them.
The ice age turned out to be much worse than anyone had expected. The oceans largely dried up and froze, leaving vast salt flats ringed in glaciers. The star shows no sign of recovering within the next half a million years.
The people who chose to outlast the unending winter built armored cities that could survive the crushing weight of the glaciers, and used nuclear power to produce light and heat. Over time, most of those cities died, and those that didn't slowly shifted to burning natural gas and harnessing what geothermal heat they could find. They acquired new resources by plundering the bones of their old infrastructure in vast networks of ice mines. These cities are only visible from the surface of the ice by their black fumaroles. They trade with each other by sending caravans over the glaciers from one fumerole to the next, heavily guarded against the ice-people who they fear as monsters.
Those who chose to adapt to the cold underwent drastic genetic alterations. Most species they tried to bring with them died within the first hundred years. The most prevalent surviving species are ice-wheat, a small grain plant that can grow directly on ice, and the great green near-fungal mats that grow on the warmer ice. The people themselves have reverted to the stone age, using the bones and pelts of those species that can survive the harsh climate as tools and housing. They sometimes build massive ice-cliff cities into the walls of the glaciers. Some of their great monuments are visible from orbit, dedicated to their spirits of cold, fire, wind, and the various animals they hunt.