An in-system hyperspace jump is a strategy used by many players to escape overwhelming opposition without failing quests thet require you to remain in the system until the quest is complete. It is a simple strategy. If outnumbered by opponents, all you have to do is to call up the hyperspace screen, click the system thay you're in, and make a jump to another sector in that same system. It is a good diea to shunt the reactor power to the shields while making the jump and waiting for the jump to be calculated, as this furthers your chances of survival.