Glossary · term

Big Bang nucleosynthesis

Cosmology

Aliases
nucleosynthesis, primordial
Domain
Cosmology

Definition

The first few minutes, when the universe was hot enough to fuse protons and neutrons into helium and traces of lithium; the predicted 24 % helium by mass is what we see.

Open on the Glossary shelf — the interactive card, the filters, and everything alongside it.

From the Glossary database in Notion, last edited 2026-08-17. This page is the row, rendered by the build; nothing on it is written by hand.