OPS no longer require a colonization technology  slot, they are allowed to build a defense, as well as on the PS.
From now on, one can build domes on the OPS regardless of the race of the owner.
OPS is the Orbital Pirate Station. Players can intercept it from each other. In the very beginning the owner of the OPS is a pirate.
PS is a planetary pirate station, which is being reformed now.

Victoria, 
Would you be so kind to share what are the thoughts on reformation of planetary pirate station?