Engines are the main form of propulsion for the starships in No Man's Sky.
Landing Thrusters are used for take-off and landing on the surface of planets and moons. They are fueled by Plutonium.
Pulse Engines are sub-light boosters used in orbit for quick travel between planetary bodies within the same solar system. They are fueled by Thamium9, and have many upgrades to increase their fuel efficiency.