Trondheim
An icy planet, named after a real life Norwegian city. Trondheim is Ender's home at the beginning of Speaker for the Dead. When Ender leaves for Lusitania, Valentine stays with her husband on Trondheim. While Ender is on Trondheim, he works as a professor in a local university. (discipline not given) Later on Lusitania he mentions to Ela that without the ability to row a boat, you would be as good as crippled on Trondheim.
The planet is mostly tundra and cold seas, however, the equatorial region can support human life relatively well. The chief industry appears to be fishing and hunting a local seal-like creature. The main religions are Calvinist and Lutheran Protestantism. The planet has not been settled very long, with some dwellings in the main city being modified caves.
Read more about this topic: List Of Ender's Game Series Planets