Investigation: The Earth is flat

The statement asserts that the Earth is flat, without providing attribution, evidence, or additional context.

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The Earth is flat.

Contradicted: P is the factual claim that the Earth is flat. The search assessment and fact-check assessment agree that this claim is contradicted. The search evidence includes Britannica's description of Earth as a globe and roughly spherical planet rather than a flat entity, Wikipedia's description of Earth as an ellipsoid with different equatorial and polar diameters, and NASA's planetary facts supporting Earth's global spherical/planetary structure. The fact-check assessments independently, though from the same publisher, rate flat-Earth-related claims false. The remaining uncertainty is not whether Earth is flat, but the precise geodetic description of Earth as an oblate ellipsoid/geoid rather than a perfect sphere. That distinction does not support the claim that Earth is flat.

Confidence in this judgment: 99%

The submitted statement is a bare assertion with no supporting evidence.

The fact-check evidence consists of two USA Today assessments, so it is not independent across publishers.

The fact checks address specific flat-Earth-related claims and do not exhaust every possible formulation of the claim.

Some search results were snippets or commercial map-product pages and were not necessary for the conclusion.

The Wikipedia document was truncated, though the relevant passages about Earth's ellipsoidal shape were available.

The evidence does not provide a full primary observational dataset, but it is sufficient to strongly contradict the claim that Earth is flat.