The Twins are locked in eternal conflict, B is a planet of rock and water, with no animals or plants. A is a planet covered in Ocean, with thousands of animals living under the waves. On A, the Oppi live on floating cities, with their agriculture, and life support being provided by the planet, which has a similar atmosphere to Oppen. B is home to settlements with carefully constructed bio-spheres covered by glass and a carefully monitored force-field, agriculture is hard, but because of their easier access and more potential landing zones they receive far more supplies than A, they also need more supplies. It’s moon, Andr, is larger than our moon and about the size of Mars, it is home to some fungi and bacteria but no complex organisms. It has been explored by the colonists of A who sent a probe and explorers.