Fred Hoyle offered a hypothesis for the origin of heavy elements. Beginning with a paper in 1946, and expanded upon in 1954, Hoyle proposed that all atomic nuclei heavier than lithium were synthesized in stars. Both theories agreed that some light nuclei (hydrogen, helium and a small amount of lithium) were not produced in stars, which became the now-accepted theory of Big Bang nucleosynthesis of H, He and Li.