The Valkyrie is a theoretical spacecraft designed by Charles Pellegrino and Jim Powell (a physicist at Brookhaven National Laboratory).
The Valkyrie is theoretically able to accelerate to 92% the speed of light and decelerate afterward, carrying a small human crew to another star system.
Instead of a solid spacecraft with a rocket at the back, Valkyrie is built more like a cable car train, with the crew quarters, fuel tanks, radiation shielding, and other vital components being pulled between front and aft engines on long tethers.
[1] The chief feasibility issue of Valkyrie [citation needed] (or for any antimatter-beam drive) lies in its requirement of tons of antimatter fuel.
Since half a kilogram of antimatter would yield 9×1016 J if annihilated with an equal amount of matter,[3] this quickly adds up to enormous energy requirements for its production.
This may be solved by creating a truly enormous power plant for the antimatter factory, probably in the form of a vast array of solar panels with a combined area of millions of square kilometers or many fusion reactors.
As long term space flight at interstellar velocities causes erosion due to collision with particles, gas, dust and micrometeorites the tethers are literally lifelines.