I did a quick check and you need high science skill (Which you have), and more than 150 renown.
darn. how do you even get renown? i have about 50, and i don't think i made a save that has enough time to get enough.
Noticeboard quests give you 2 renown each. NPC skill events give you 1 renown each. Normal quests should also give you some renown. I think there are other ways too, but renown is pretty hard to get in general.