@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<http://astrothesaurus.org/uat/194>
  skos:prefLabel "Carbon-nitrogen cycle"@en ;
  a skos:Concept ;
  skos:broader <http://astrothesaurus.org/uat/768> .

<http://astrothesaurus.org/uat/1299>
  skos:prefLabel "Proton-proton reaction"@en ;
  a skos:Concept ;
  skos:broader <http://astrothesaurus.org/uat/768> .

<http://astrothesaurus.org/uat/768>
  skos:narrower <http://astrothesaurus.org/uat/1299>, <http://astrothesaurus.org/uat/194> ;
  dc:contributor <http://editor.vocabs.ands.org.au/user/AAS_Frey.Katie_Admin> ;
  skos:broader <http://astrothesaurus.org/uat/1131>, <http://astrothesaurus.org/uat/1616> ;
  skos:definition "A series of thermonuclear reactions, taking place mainly in low-mass stars, such as the Sun, which transforms four hydrogen nuclei (protons) into one helium (Helium-4) nucleus and thereby generates energy in the stellar core. First, two protons (Helium-1) combine to form a deuterium nucleus (Helium-2) with the emission of a positron and a neutrino.  The deuterium nucleus then rapidly captures another proton to form a Helium-3 nucleus, while emitting a gamma ray. There are three alternatives for the next step. In the proton-proton chain, occurring in 86% of the cases, two Helium-3 nuclei fuse to a final Helium-4 nucleus while two protons are released. The mass of the resulting Helium-4 nucleus is less than the total mass of the four original protons. The difference, ~ 0.7% of the total mass of the protons, is converted into energy and radiated by the Sun. In this process, the Sun loses some 4 million tons of its mass each second."@en ;
  dc:modified "2020-11-02T17:06:21.627Z"^^xsd:dateTime, "2020-11-02T17:06:37.11Z"^^xsd:dateTime ;
  skos:editorialNote [ ] ;
  skos:prefLabel "Hydrogen burning"@en ;
  a skos:Concept .

<http://astrothesaurus.org/uat/1616>
  skos:prefLabel "Stellar nucleosynthesis"@en ;
  a skos:Concept ;
  skos:narrower <http://astrothesaurus.org/uat/768> .

<http://astrothesaurus.org/uat/1131>
  skos:prefLabel "Nucleosynthesis"@en ;
  a skos:Concept ;
  skos:narrower <http://astrothesaurus.org/uat/768> .