Your account has received 1 units of Planetary Core artifacts. You can view and use this artifacts at Manage Empire > Science > Artifacts.

Reason: Compensation for bug - Artifact consumed even after warning message of being at max colonies. 

Each time you use this core you will receive 200 to 2,500 new planets on all your planetary systems. To fully use this artifact, try to to create as many new systems as posssible before using this artifact. Remember that planets will increase your Pr, and usually the higher the Pr the better and more experience players is