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What does nuclear fusion mean?

Looking for the meaning or definition of the word nuclear fusion? Here's what it means.

Noun
  1. (physics) The combining of the nuclei of small atoms to form the nuclei of larger ones, with a resulting release of large quantities of energy; the process that makes the sun shine, and hydrogen bomb explode.
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The opposite process, nuclear fusion, where nuclei are joined together, also releases energy.
Normally, stars balance the gravitational force with the pressure from the nuclear fusion reactions inside.
These dark nebulas are places where new stars are beginning their gravitational collapse and have yet to begin nuclear fusion.
I used to be a designer draughtsman working on the nuclear fusion project at the Culham laboratories in Oxfordshire.
Unlike stars like the Sun, brown dwarfs don't have enough mass to generate energy through nuclear fusion.
Various propulsion schemes have been proposed, from nuclear fusion to antimatter to laser sails.

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