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===The P-P II branch===
Lithium is made by a proton-proton chain reaction.
[[File:Proton-Proton II chain reaction.svg|thumb|Proton–proton II chain reaction]]
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The P-P II branch is dominant at temperatures of 14 to {{val|23|u=MK}}.
The amount of lithium generated in [[Big Bang nucleosynthesis]] can be calculated.<ref>{{cite journal | bibcode= 1985ARA&A..23..319B | title= Big bang nucleosynthesis – Theories and observations | last1= Boesgaard | first1=A. M. | last2= Steigman | first2= G. | volume= 23 |date= 1985 | pages= 319–378 | journal= Annual Review of Astronomy and Astrophysics |id=A86-14507 04–90 |___location=Palo Alto, CA | doi= 10.1146/annurev.aa.23.090185.001535}}</ref>
Models of the collisions that would have occurred found that there would have been one helium atom for every ten hydrogen atoms which fits with the observations of young stars.<ref name="habitable">{{cite book |isbn=978-0691140063}}</ref>
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