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Thruster Propellant is one of two sources of propulsion in Space Agency, the other being Fuel  You can see how thruster propellant a craft has by looking in the top right corner above the main fuel tank indicator. Thrusters on the side of a craft use thruster propellant to rotate it and/or move the vehicle. It provides a small constant amount of thrust each time it is fired to turn the craft or move it slowly forward or backwards.