It a happens to every referee at one time or another. The players jump in-system, dock at a starport, offload passengers and cargo, and then ask a string of questions.
'So, what other ships are in the port?'
'This cargo of pharmaceuticals - which does it actually contain?'
'I go to the bar for a few drinks. Who else is around right now?'
This book will allow you to answer those questions with the minimum of effort, giving every appearance to your players that you created your universe down to the very last detail. You come off looking like a World Class referee, while your players have the joy of experiencing a bustling universe where there are plenty of other poeple around who clearly have their own lives to lead, making it feel like a real, living, breathing place.