The US has finished constructing a huge physics experiment aimed at recreating conditions at the heart of our Sun.
The US National Ignition Facility is designed to demonstrate the feasibility of nuclear fusion, a process that could offer abundant clean energy.
The lab will kick-start the reaction by focusing 192 giant laser beams on a tiny pellet of hydrogen fuel.
To work, it must show that more energy can be extracted from the process than is required to initiate it.
Professor Mike Dunne, who leads a European venture that is also pursuing nuclear fusion …