Academy

The academy is the location where children of the planets affiliated with the Imperium are taken for training after they pass the Imperium Tests.

Information
According to the episode, "The Lost". Over the last decade when the Imperium were taking over, they've been taking children from 13-18 to their planet's moon to induct into the academy.

Trivia

 * Only 30% manage to get into the academy. The remaining 70% are sent to planets to mine fuel for the Imperium's ships.
 * The fuel when split on Adults turns them into giant blue goo monsters.