You are on a Generational Colony Ship headed for a distant star, the Isaac Asimov. The ship is equipped to handle such a long journey. It uses an FTL drive, but it's slow to get to it's destination.
Most things are powered by the Ether. Including it's electrical systems. Currently, the ship is riding or following a Birkland current. A line of plasma stretching far into space. The Asimov is also following a ship that releases Fold Gates into other star systems, allowing them to be explored by ship (Starship Operations Manual, page 10). That ship, the Sheffield is crewed by androids. The designers of the ship Allowed The atmospheric temperature on aboard the Asimov to be regulated. There are no seasons, only eternal Spring (late April, early May). The environment is also regulated that waste is recycled.
At least five (5) civilizations rose and fell on the Generation ship, allowing for a number of religious systems and mythologies to be created. Currently everyone is naked aboard ship, due to the regulated atmosphere. Earth (or Golarion) is a distant, mythical memory.
Most people are happy on the Asimov. But the current civilization aboard ship is in decline. Class distinction has arisen on the Asimov, despite the nudity. There are the Rich, the Middle Class, and the Poor, with the Untouchables running the recyclers.