nucleocosmochronology
/ˌnjuːklɪəʊˌkɒzməʊkrəˈnɒlədʒi/Astronomy
noun
Nucleochronology, especially as used to infer the age of the universe from the ages of the chemical elements.
Origin
1960s. From nucleo- + cosmo- + chronology. Compare slightly later nucleochronology.