According to modern cosmological theory, lithium—in both stable isotopes (lithium-6 and lithium-7)—was one of the three elements synthesized in the Big Bang.
Ifølge moderne kosmologisk teori var lithium — i form af begge stabile isotoper (lithium-6 og lithium-7) — et af de 3 grundstoffer, der blev syntetiseret i Big Bang.