The Puzzle of the Plasma Doughnut

Nuclear fusion offers a potential era of clean, endless energy by fusing atoms to release energy, a process distinct from the fission used in current reactors. Unlike fission, which splits heavy atoms like uranium, fusion combines light atoms like hydrogen, yielding four times the energy with significantly less radioactive waste and no risk of runaway chain reactions. Achieving fusion on Earth requires creating a plasma—an electrically charged gas—heated to hundreds of millions of degrees to overcome electrostatic repulsion. While large-scale experimental reactors like ITER in France serve as proof-of-concept, private companies are increasingly investing in smaller, more agile designs to accelerate commercial viability. Beyond terrestrial power generation, fusion technology holds the potential to revolutionize space travel by providing a high-density energy source capable of powering long-distance missions across the solar system.