Experience Point
From Planetarion Wiki
Experience Points (XP) are a major factor in determining Score. (Score is determined by the following formula: XP times 60, plus Value.) XP was introduced with [PAX].
Essentially, you gain XP based on how active of a player you are. Here's where XP comes from-
Capturing asteroids (The amount of XP you gain from this is determined by the target's value in relation to yours)
Running covert operations
Doing scans. [Category:Terminology]