In southern France, 35 nations are collaborating to build the world's largest tokamak, a magnetic fusion device that has been designed to prove the feasibility of fusion as a large-scale and carbon-free source of energy based on the same principle that powers our Sun and stars. Photo: ITER Organization.

In southern France, 35 nations are collaborating to build the world's largest tokamak, a magnetic fusion device that has been designed to prove the feasibility of fusion as a large-scale and carbon-free source of energy based on the same principle that powers our Sun and stars. Photo: ITER Organization.

A star on Earth

ANU physicists are helping lead a global effort to make a star on Earth, otherwise known as a nuclear fusion facility that could produce inexhaustible clean power. Will Wright reports.

Energy pundits see nuclear fusion as the Holy Grail. Nuclear fusion occurs in nature – powering the Sun and all the stars in the Universe – and is considered to be the ultimate source of all renewable power.