2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/13982We summarize the history, theory, observational status, and implications of big-bang nucleosynthesis.Text and 7 color eps figures from poster for the DAP "Great Discoveries in Astronomy in the Last 100 Years" exhibit at APS centennial meeting; gif of 36"x36" poster available at http://gamma.nrl.navy.mil/dap-aps/dapaps/indexp2.htmAstrophysicstext