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nuclear fusion
1. A process by which matter changes to energy.

The nuclei of lighter atoms fuse, or join, to form heavier nuclei, releasing energy.

2. The process which keeps stars, like the sun, luminous for billions of years.

In general, nuclear fusion involves the "fusing" together of atomic nuclei of low mass to form heavier nuclei. A vast amount of energy is released in the process.

This entry is located in the following unit: Astronomy and related astronomical terms (page 17)
Nuclear sites in Germany face closure
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"Seven nuclear power plants in Germany that were shut down after the Fukushima disaster in Japan are likely to be closed permanently afte a decision by state environment ministers."

"A government agency warned, however, that without the seven plants Germany could have trouble coping with a failure in some part of the national power grid."

The Global Edition of the New York Times, May 28-29, 2011; page 15.