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If we are talking about nuclear fusion, this requires two nuclei to be brought into very close contact, and normally the electrostatic repulsion between two positively charged nuclei will prevent this. The two elements have to be raised to a very high temperature and squeezed together by a strong magnetic field. This can be done in a tokamak, and has been done, but only for less than 1 second so far. The ITER apparatus which has just started construction should produce a longer lasting reaction.

In the sun and other stars fusion is produced by the enormous gravitational compression at the star's core, which is not possible to reproduce in man made equipment. It would need a piece of apparatus bigger than the Earth!

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