Navigation in Outer Space
Probably the most valuable tool for navigation, aside from your ship's piloting controls, is the radar which has two settings: long range and short range. Long range sensors help navigate the entire system from planet to planet.
Long Range Sensor Mode
Since space is infinite, you may find the green indicators stuck to one side or the other indicating roughly which direction you flew when you left the radar's scope. Simply turn the other direction to return to the center of the system, or use the hyperspace drive to travel to another system.