---
id: kb-2026-00333
title: Theory of Relativity
schema_type: TechArticle
category: science
language: en
confidence: medium
last_verified: '2026-05-28'
created_date: '2026-05-22'
generation_method: ai_assisted
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-science-001
    statement: Britannica describes special relativity as applying to nonaccelerating frames of reference.
    source_title: Special relativity
    source_url: https://www.britannica.com/science/special-relativity
    confidence: medium
  - id: fact-science-002
    statement: >-
      Britannica describes general relativity as Einstein's theory of gravitation based on spacetime
      geometry.
    source_title: General relativity
    source_url: https://www.britannica.com/science/general-relativity
    confidence: medium
  - id: fact-science-003
    statement: >-
      Einstein's 1916 book Relativity presents both the special and general theory for a broad
      audience.
    source_title: 'Relativity: The Special and General Theory'
    source_url: https://www.gutenberg.org/ebooks/5001
    confidence: medium
completeness: 0.88
known_gaps:
  - >-
    Coverage intentionally narrowed to directly sourced public evidence; adjacent subtopics are not
    exhaustively covered.
disputed_statements: []
primary_sources:
  - title: Special relativity
    type: reference
    year: 2026
    url: https://www.britannica.com/science/special-relativity
    institution: Encyclopaedia Britannica
  - title: General relativity
    type: reference
    year: 2026
    url: https://www.britannica.com/science/general-relativity
    institution: Encyclopaedia Britannica
  - title: 'Relativity: The Special and General Theory'
    type: book
    year: 1916
    url: https://www.gutenberg.org/ebooks/5001
    institution: Project Gutenberg
secondary_sources: []
updated: '2026-05-28'
---
## TL;DR

Relativity describes how measurements of space, time, and gravity depend on motion and gravitation. This repair removes unsupported experimental and superlative claims and cites stable relativity references.

## Core Explanation

The article now separates special relativity from general relativity. Special relativity connects inertial observers and the invariant speed of light; general relativity treats gravitation through spacetime geometry. Historical claims are kept to conservative source-backed statements.

## Further Reading

- [Special relativity](https://www.britannica.com/science/special-relativity)
- [General relativity](https://www.britannica.com/science/general-relativity)
- [Relativity: The Special and General Theory](https://www.gutenberg.org/ebooks/5001)

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