An engine, drive, or thruster, was a machine specially designed to propel vehicles through the gravity of a planet, navigate the vacuum of space or launch a spaceship into hyperspace for interstellar voyage.
The technologies of engines that allowed this three categories of advanced travel to exist were:
- Repulsorlift (For use in the nearby of a gravitational force and near-orbit planetary travel)
- Sublight drive (For extended operations in System space or Deep space)
- Hyperdrive (For interplanetary and interstellar travels)