How to Fuel Your Rocket and Where to Get Fuel

Understand the two fuel types

Ad Astra uses Fuel Buckets for standard rockets and Cryo Fuel Buckets for higher-tier or cryo-based engines. Standard Fuel is refined from oil, which you obtain by placing an Oil Derrick or pumping from an oil deposit in the world. Cryo Fuel is a colder, more advanced propellant used by later engines and requires additional processing. You cannot mix them — check which fuel your engine accepts before filling.

Refine oil into fuel

Pump or collect crude oil, then run it through the mod's refinery or fuel-processing machine. The refinery converts crude oil into usable Fuel Buckets. Store finished buckets in a chest near your Launch Pad so refueling is quick. For Cryo Fuel, feed the appropriate input into the cryo-fuel machine and collect Cryo Fuel Buckets.

Refuel and top off

Right-click your assembled rocket to open its fuel slot and insert a Fuel Bucket. The rocket's fuel gauge fills; a full tank is required for interplanetary travel. Remember that landing and taking off again consumes fuel, so always carry at least one spare Fuel Bucket per planned trip. If you run dry on another planet, you must refine local resources or send a resupply — plan your round trip before launching.