Is it possible to build a star on earth?When asked what problem he hoped scientists will have solved by the end of the century, Professor Stephen Hawking replied 'I would like nuclear fusion to become a practical power source. It would provide an inexhaustible supply of energy, without pollution or global warming.' But what is nuclear fusion, and could it really be the answer to the climate emergency? Fusion exists already in the stars that fill our universe with li...

Is it possible to build a star on earth?When asked what problem he hoped scientists will have solved by the end of the century, Professor Stephen Hawking replied 'I would like nuclear fusion to become a practical power source. It would provide an inexhaustible supply of energy, without pollution or global warming.' But what is nuclear fusion, and could it really be the answer to the climate emergency? Fusion exists already in the stars that fill our universe with li...