Propellantless propulsion

Propellantless propulsion refers to a method of moving an object without the traditional use of fuel or propellant, such as rocket engines that expel mass to generate thrust. Instead, it leverages alternative principles, like electromagnetic forces or momentum transfer, to create movement. One example is the electromagnetic propulsion used in some experimental spacecraft that harnesses magnetic fields. Another concept involves the idea of exploiting gravitational interactions or radiation pressure. While still largely in the experimental stage, propellantless systems could potentially enable more efficient travel in space, reducing the need for bulky fuel supplies.