Nuclear fusion of light elements like hydrogen or helium would permit approaching the speed of light. It seems very attractive to refuel your space ships where the fuel is.
The Making of the Pacemaker: Celebrating a Lifesaving Invention (ed. 2000)
Nuclear fusion of light elements like hydrogen or helium would permit approaching the speed of light. It seems very attractive to refuel your space ships where the fuel is.
The Making of the Pacemaker: Celebrating a Lifesaving Invention (ed. 2000)