Planet Bryyo (lore)
"Federation scouts discovered the planet Bryyo ten years ago. The planet’s alignment makes most of its surface uninhabitable; 48% of the world is always exposed to the sun, with another 48% shrouded in permanent night. The remaining 4% lies in an equatorial ring of fertile jungle, where the bulk of Bryyo’s bioforms dwell.
Fuel Gel is common on Bryyo, which makes it extremely important to the Federation. The local bioforms are quite primitive, though there are ruins that indicate an advanced culture thrived on Bryyo in centuries past.. "