CNO cycle

noun

ˌsē-ˌen-ˈō- How to pronounce CNO cycle (audio)

: the process by which large stars convert elemental hydrogen into helium through a series of nuclear fusion reactions

To become a supernova, the progenitor star had to be at least eight times our Sun's mass, so it must have fused hydrogen into helium via the CNO cycle, a reaction that uses carbon, nitrogen, and oxygen as catalysts.

Wayne J. Parker, Sky & Telescope, January 1995

Note: Stars that are roughly twice the size of the Sun or larger convert hydrogen by means of the CNO cycle, in which hydrogen nuclei combine with and then separate from carbon, nitrogen and oxygen in a specific repeating loop that generates both helium and extra energy. Smaller stars also fuse hydrogen into helium, but the process is different and does not involve other elements.

单词	CNO cycle
释义	CNO cycle noun ˌsē-ˌen-ˈō- : the process by which large stars convert elemental hydrogen into helium through a series of nuclear fusion reactions To become a supernova, the progenitor star had to be at least eight times our Sun's mass, so it must have fused hydrogen into helium via the CNO cycle, a reaction that uses carbon, nitrogen, and oxygen as catalysts. Wayne J. Parker, Sky & Telescope, January 1995 Note: Stars that are roughly twice the size of the Sun or larger convert hydrogen by means of the CNO cycle, in which hydrogen nuclei combine with and then separate from carbon, nitrogen and oxygen in a specific repeating loop that generates both helium and extra energy. Smaller stars also fuse hydrogen into helium, but the process is different and does not involve other elements. Word History First Known Use 1958, in the meaning defined above
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CNO cycle

noun

Word History