I've been writing some flavor text for my next board game release, which is about settling a colony in/on different planets, and I am not sure if I'm using those two prepositions correctly, if I have to use always the same or if it depends on the context.
Some of the examples are:
- This is a tough planet to settle a colony in/on.
- It has the conditions we need to settle in/on it.
- We will settle our colony in/on the icy, rocky surface.
- We were forced to land and settle in/on the dark side of the planet.
- We will settle in/on the sunny hemisphere.
- There are some regions with mountains and plateaus, and the colony has settled in/on one of them.
Is there any formal rule about this?
Also, do you think I should use another synonym, like "establish" or similar?