I think fission fragment rockets might be more promising. Doable with current tech, they can have exhaust velocities of a few percent the speed of light (specif

I think fission fragment rockets might be more promising. Doable with current tech, they can have exhaust velocities of a few percent the speed of light (specific impulse in the 6 figures), comparable or better than fusion engines. https://en.wikipedia.org/wiki/Fission-fragment_rocket https://en.wikipedia.org/wiki/Fission-fragment_rocket