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After years of hard work, scientists have some fantastic news.
Scientists did an experiment.
It was an experiment in nuclear fusion and it worked.
In the future, this process could give us clean energy.
The scientists were from the National Ignition Facility, in California, the US.
They made a small box very hot.
Inside the box were some hydrogen atoms.
The atoms 'fused' – they joined together.
That's nuclear fusion.
It wasn't the first time for scientists.
But it was the first time the experiment produced extra energy.
So scientists were excited.
Nuclear power stations use nuclear fission.
That's different from fusion.
Fission divides atoms into two or more parts.
Nuclear fission produces waste.
It's bad for the environment.
Nuclear fusion's clean.
It could be the answer.
It could help stop climate change.
Scientists know this is one step.
The energy from the experiment was small.
But it gives scientists hope.