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
Nuclear - A nuclear weapon has a devastating potential to cause damage. A few countries around the world have them.
Plasma - a gas charged with electricity, found in stars such as the Sun. Physicists regard it as a state of matter, along with gas, liquid and solid.
Atoms - The smallest unit of any chemical element.
CO2 - Carbon dioxide.
Chernobyl - The disaster, in 1986, involved a meltdown at a nuclear plant in Ukraine.