AIMStar was a proposed antimatter-catalyzed nuclear pulse propulsion craft that uses clouds of antiprotons to initiate fission and fusion within fuel pellets.
A magnetic nozzle derives motive force from the resulting explosions.
The craft was designed to reach a distance on the order of 10,000 AU from the Sun, with a travel time of 50 years, and a coasting velocity of approximately 960 km/s after the boost phase (roughly 1/300th of the speed of light).
The probe would be able to study the interstellar medium as well as reach Alpha Centauri.
This article about one or more spacecraft of the United States is a stub.