I'm probably going to give away more than I would like, but I really need advice. I'm writing a science-fiction novel where military and ordinary people can travel in outer space. The problem is, I can't envision where someone would leave there space craft should they want to step out and go somewhere on the planet. A number of possible solutions pop-up, but I end up finding problems and to me it just doesn't flow well Rule: Space craft are not allowed to land in the city, you can't just land in front of the place you want and get out. Possible Solutions: 1. They can dock there craft at a space station and take a smaller craft down (a transport craft if you will). They can take a bigger craft with a lot of people down to the planet, when they are finished and want to leave the planet, they can take the same transport craft back to the station, and then obtain the craft they came with in the first place. Problem: You have to believe that overcrowding never happens and that there is always space available to dock. 2. They can land at a ship yard on the planet. Problem: Overcrowding never happens? I just don't buy it, when the planet allows people/aliens to come and go as they please overcrowding can happen from time to time. The next problem I have is, I just can't comprehend how no security check is done on people/aliens who are traveling from one planet to another. I've been throwing around ideas on how this could be done, but it just seems no matter what ideas I come up with, it can be exploited. I was thinking a sort of force field to surround the planet, or senors to detect ships. Thanks in Advanced.