Fuel

Fuel is one the largest commodities within the galaxy, without it space travel becomes impossible. As such corporations that specialize in fuel production and transportation are invested in heavily, though the monopoly on fuel has become a problem.

Propellant
Propellant is a fuel that is combined with an oxidizer then ignited to cause reaction thrust behind a ship's engines. Ships with larger mass require a significantly higher amount of fuel to move, taking much longer to move than others.

Obtaining Propellant
Liquid Propellant is gained from mining oil from asteroids and planets. It must be refined before use into Kerosene in vast refineries near to the mining site, though some heavy mining ships can have their own refineries built in.

Gaseous Propellant is gained from harvesting highly volatile gases within Nebulae and Gas Giants. Nebulae harvesting can also be done in an event such a ship cannot land or has no mining equipment, most deep-space ships such as mining or exploration vessels will have these or at least one ship capable in a fleet.

Antimatter
Powering large ships and Hypershock Drives requires an immense amount of highly focused energy. This comes in the form of Antimatter and the process of reacting it to create the energy required to power these devices.

Obtaining Anti-matter
Anti-matter particles can be gained from several sources but they will all come from Cosmic Rays, these are emitted by stars from all over the galaxy and also by black holes. Gaining anti-matter is a highly risky job as in order to catch the most of it, ships and stations have to be stationed almost near to a Star's Corona. Fuel harvesting ships need to have significant thermal protection should they venture this close.