The Artifical Slave Center (ASC) gives a *huge* bonus to *all* planets, however this bonus is not listed anywhere.

It's basically a hard-coded bonus that increases base military production on all planets. This is a 50% bonus and the reason it's so powerful is that it adds 50% to your base production and then all your other sources of production bonus from tech or abilities actually *multiply* this bonus. Most bonus is additive. If you have a 50% bonus from one source and another 50% bonus from another source then you have a total 100% bonus. However in the case of the ASC the 50% goes to your base and if you have an additional 50% bonus then you in effect get 50% of 1.5 or a total bonus of 125% instead of just 100%. The only downside is that you can only get this bonus once. If you capture a planet with another ASC on it you do not gain any additional advantage.