Nuclear fusion

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Nuclear fusion is the process by which two or more nuclei fuse to make a larger nucleus.[1] The successful fusion of two nuclei releases large amounts of energy, but to start the reactions large amounts of energy must be input to overcome the repulsive electrostatic forces.

In the center of most stars, hydrogen fuses together to form helium. Fusion in stars releases so much heat that the process alone keeps their mass from collapsing in on itself due to gravity. It is the reason that stars are so stable as well. If the core of a star starts to collapse, more fusion reactions occur and it expands again from the heat. If the core expands too far, less fusion reactions occur and it collapses back down.

Scientists here on earth are trying to make nuclear fusion in the laboratory a useful energy source. Uncontrolled fusion causes thermonuclear explosions, which are used in the hydrogen bomb.


APOD Glossary

See Also

Nuclear fission


  1. Wile, Dr. Jay L. Exploring Creation With Physical Science. Apologia Educational Ministries, Inc. 1999, 2000