Think of space as water, and your space ship acting as a ship. When you approach the planet, you will have to dock your ship at a spaceport and traverse the planet on foot. In order to gain access to the planet, the spaceport you wish to dock at must be neutral to or owned by your faction. The red line around the planet is an invisible wall, requiring you to go through the spaceport. This is to make taking over planets more strategic. You wouldn't expect to be able to just approach a hostile planet and land on the surface without any resistance. As for the planets themselves, the will be a lot like islands. Each planet will have a variety of different fiefs, and each will differ in terms of architecture, population, and trade goods. Hopefully that clarifies things.
xTBRO13
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