Duna

Terraforming has begun but isn't yet complete, this was the first planet to be colonized and the last to secede from Kerbin. It has a highly profitable trade with Kerbin wherein Kerbin sends scrap metal to Duna, which they reverse electrolyse to remove the rust from Dunan dust. They then send portions of the iron into space and use the vacuum to flash weld them into whatever precise configuration is necessary on Kerbin. Whatever dust is unused in the construction of new products is kept by Duna. Duna produces all its own consumables. Fuel is mined from Ike, water and oxygen are extracted from the soil, and food is grown. Duna does not sell consumables to any other planets. Duna is in the Kerbin Confederation Duna names its ships after their captains.