The secret behind a record-breaking nuclear fusion experiment that spit out 10 quadrillion watts of power in a split second has been revealed: a 'self-heating' – or 'burning' – plasma of neutron-heavy hydrogen inside the fuel capsule used in the
Nuclear fusion releases vast amounts of energy when atomic nuclei are"fused" – that is, joined together – into larger nuclei.
Because stars are very large, their strong gravity means the fusion reactions take place at very high pressures. But here on Earth such pressures aren't feasible – and so fusion reactions must take place at very high temperatures instead. The inertial confinement approach was pioneered for testing thermonuclear weapons, and it is a long way from being a viable power source – such a power source would have to vaporize several such fuel pellets every second to have a great enough energy output to generate useful amounts of electricity.
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