The National Spherical Torus Experiment-Upgrade (NSTX-U), a large circular device surrounded by a platform and steps leading to it
The National Spherical Torus Experiment-Upgrade (NSTX-U) at the Princeton Plasma Physics Laboratory.
  • It's been almost 90 years since scientists made the first fusion reaction in a lab.
  • But trying to create power from fusion presents a lot of problems.
  • Two experts explain how long it could take until fusion power plants are possible.

Over the past year, nuclear fusion experiments at the National Ignition Facility achieved a huge milestone when their reactions yielded more energy than they put into it.