I have all star systems except for one star on UV Nebula which allows x2 Quintessence production. I have a feeling that I should have unlocked Quintessence earlier, and I'm not sure if I'm missing something, but how am I supposed to get it? I've spent billions on exploration hoping it's a node to unlock and the corruption is killing me because I can't produce enough pristine light without Quintessence. How do I produce it?