 where e + is a positron , γ is a gamma ray photon , νe is a neutrino , and H and He are isotopes of hydrogen and helium , respectively . The energy released by this reaction is in millions of electron volts , which is actually only a tiny amount of energy . However enormous numbers of these reactions occur constantly , producing all the energy necessary to sustain the star 's radiation output . In comparison , the combustion of two hydrogen gas molecules with one oxygen gas molecule releases only 5 @.@ 7 eV . 
 where e + <a href='drop_aux' title='1'><mark>is</mark></a>a positron , γ is a gamma ray photon , <a href='uninflect' title='2'><mark>νe</mark></a> is a neutrino , and H and He <a href='drop_aux' title='3'><mark>are</mark></a>isotopes of hydrogen and helium , respectively . The energy released by this reaction is in millions of electron volts , which <a href='drop_aux' title='4'><mark>is</mark></a>actually only a tiny amount of energy . However enormous numbers of these reactions occur constantly , producing all the energy necessary to sustain the star <a href='null_genetive' title='5'><mark>'s</mark></a>radiation output . In comparison , the combustion of two hydrogen gas molecules with one oxygen gas molecule <a href='uninflect' title='6'><mark>releases</mark></a> only 5 @.@ 7 eV . 
Where e + a positron , γ is a gamma ray photon , νed is a neutrino , and H and He isotopes of hydrogen and helium , respectively . da energy released by this reaction is in millions of electron volts , which actually only a tiny amount of energy . However enormous numbers of dem reactions occur constantly , producing alll the energy necessary to sustain the star  radiation output . In comparison , tdacombustion of two hydrogen gas molecules with one oxygen gas molecule release only 5 @.@ 7 eV .