The universe is 13.8 billion years old; for the first 380,000 years it was a fireball filled with light and particles; observations of the cosmic microwave background radiation (the cooled light from that ancient fireball) allow us to photograph and study the early universe.
factualpending
Evidence Quote
“The universe is 13.8 8 billion years old. ... For the first um uh the first 380,000 years of the universe, it was filled with a fireball.”
Source
Quantum Fields: The Real Building Blocks of the Universe - with David Tong— The Royal InstitutionCreated: 8/10/2026, 10:55:31 PM
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