Is nuclear fusion the future? The race is heating up to bring star power down to Earth. But some scientists are sceptical this technology will ever be more than science fiction.
China’s artificial sun sets new world record
Starstruck: Large stars such as the one above produce huge amounts of energy. Glossary
Fossil Fuels - Non-renewable fuels such as coal or gas, formed in the geological past from the remains of living organisms.
Pipe dream - Something that will never happen - that a smoker might dream about while puffing on a pipe.
Chernobyl - The disaster, in 1986, involved a meltdown at a nuclear plant in Ukraine.