ashampine

I've been playing for a while but I'm trying to delve into larger and more complex maps, and I've realized that I don't understand how a few things work. I'm hoping that you can help me out. 1. When jumping from star to star, can you jump to any planet on the other star? If not, which ones can you jump to? How does this differ from using wormholes, which appear to connect only to one another? 2. What precisely do trade ports and orbital refineries