I am currently preparing the third alpha test which will be about space flight and I am feeling uninspired and need your help!
Quick re-cap how the space flight in Prosperous Universe works. There are two methods of traveling: faster than light and slower than light.
Faster than light travel works by bending spacetime around a ship using a big reactor and field emitters. The reactor utilizes a small, contained black hole to generate the necessary energy (see black hole starship). Since black holes are also called singularities sometimes I decided to call the FTL fuel Singularium. I am pretty happy with the name, if you have other suggestions, let me know!
Now for the part where we need your ideas: We are not sure how the slower than light propulsion system works. The only limits we want to have are that it has to be much more down-to-earth than the FTL one. We would like that the ships have recognizable engines. so here is what I’ve come up with so far. In the game there is a mineral resource calls Galerite which is used together with Ammonia and Hydrogen to create the STL fuel in a refinery. The propulsion system works similar to what we know as Ion Thruster: The fuel is accelerated in a strong electrical field and provides propulsion. Since the fictitious Galerite is the main ingredient of the fuel I would call it Galium or something like that, but I am not sure. Maybe we can find another name, or even anther backstory for the STL propulsion system! I am all ears