How are scores calculated?
Space Invasion calculates three scores for any player: buildings, research and fleet. Defense will count as fleet. You get one point for every 2000 units of resources used to build - spice is not counted. If units are destroyed, buildings downgraded or colonies delete, you will lose the corresponding points.
When is the score calculated?
The scores are updated once an hour, and can be seen in the raking list. Since the left browser frame updates itself only once per day (at midnight), you need to update that frame manually to see your progress.
What is it all good for?
Your score will determine your ranking, and determine your attack zone , and therfore determine what targets you can attack, and who can attack you.