---
id: kb-2026-00368
title: Big Bang Theory
schema_type: TechArticle
category: science
language: en
confidence: medium
last_verified: "2026-05-28"
created_date: "2026-05-22"
generation_method: ai_structured
ai_models:
  - claude-opus
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: fact-big-bang-1
    statement: >-
      NASA describes the Big Bang as the leading explanation for how the universe began and evolved
      from a hot, dense early state.
    source_title: Big Bang Theory
    source_url: https://map.gsfc.nasa.gov/universe/bb_theory.html
    confidence: medium
  - id: fact-big-bang-2
    statement: Hubble reported a relation between galaxy distance and recession velocity in 1929.
    source_title: A Relation between Distance and Radial Velocity among Extra-Galactic Nebulae
    source_url: https://doi.org/10.1073/pnas.15.3.168
    confidence: medium
  - id: fact-big-bang-3
    statement: >-
      Penzias and Wilson reported excess antenna temperature that became evidence for the cosmic
      microwave background.
    source_title: A Measurement of Excess Antenna Temperature at 4080 Mc/s
    source_url: https://doi.org/10.1086/148307
    confidence: medium
completeness: 0.88
known_gaps:
  - This compact repair keeps only source-mapped public claims from the sampled audit entry.
disputed_statements: []
primary_sources:
  - title: Big Bang Theory
    type: government_report
    year: 2014
    url: https://map.gsfc.nasa.gov/universe/bb_theory.html
    institution: NASA WMAP
  - title: A Relation between Distance and Radial Velocity among Extra-Galactic Nebulae
    type: academic_paper
    year: 1929
    url: https://doi.org/10.1073/pnas.15.3.168
    doi: 10.1073/pnas.15.3.168
    institution: Proceedings of the National Academy of Sciences
  - title: A Measurement of Excess Antenna Temperature at 4080 Mc/s
    type: academic_paper
    year: 1965
    url: https://doi.org/10.1086/148307
    doi: 10.1086/148307
    institution: The Astrophysical Journal
secondary_sources: []
updated: "2026-05-28"
---

## TL;DR

Big Bang theory explains an expanding universe with evidence from galaxy recession and cosmic microwave background radiation. This repair keeps cosmology claims source-mapped.

## Core Explanation

The repaired entry replaces weak coverage with three cornerstone sources for expansion, the Big Bang model, and the cosmic microwave background.

## Further Reading

- [Big Bang Theory](https://map.gsfc.nasa.gov/universe/bb_theory.html)
- [A Relation between Distance and Radial Velocity among Extra-Galactic Nebulae](https://doi.org/10.1073/pnas.15.3.168)
- [A Measurement of Excess Antenna Temperature at 4080 Mc/s](https://doi.org/10.1086/148307)