They're produced during nuclear fusion, the reaction that lights the sun and other stars. |
The opposite process, nuclear fusion, where nuclei are joined together, also releases energy. |
These dark nebulas are places where new stars are beginning their gravitational collapse and have yet to begin nuclear fusion. |
Cold fusion is the term proposed to describe controlled nuclear fusion reactions occurring at or near room temperature. |
Various propulsion schemes have been proposed, from nuclear fusion to antimatter to laser sails. |
A second method for creating controlled nuclear fusion makes use of a laser beam or a beam of electrons or atoms. |