An
antimatter rocket is a proposed type of
rocket that uses
antimatter as its power source. There are a number of possible designs. In one, antimatter would be injected into a target of normal matter and the resulting reaction products (mostly charged particles) would be vented through a magnetic nozzle, providing thrust. A more conventional approach would be to inject the antimatter into a
tungsten block, producing heat, which could then be used to either directly heat a propellant (similar to how a
nuclear thermal rocket operates), or generate electricity to run some other propulsion mechanism. Finally, a
photon rocket involves heating up such a tungsten block or other material so it indandesces could be used - a curved mirror would then be used to reflect the photons backwards and thus accelerate the spacecraft forwards.
The chief difficulty is obtaining the antimatter, and to a lesser extent storing it. A few atoms of antihydrogen have been produced using particle accelerators, but this method is too expensive to be practical at this time.
See also: spacecraft propulsion