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the claim

The universe is flat.

the verdict
CONTESTED PARTIAL
Recorded sources
4 sources for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the universe is flat?

Partly. Several sources report that cosmic microwave background data (WMAP, Planck) are consistent with a flat universe, while a peer-reviewed paper and a physics discussion note that observations only bound curvature and cannot establish exact flatness. The evidence covers the claim only in part, as consistency within measurement errors rather than proof of exact flatness.

Verdict: CONTESTED PARTIAL · 4 sources for, 2 against · Last checked

Evidence for · 4
Shape of the universe
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Shape of the universe. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Shape_of_the_universe

Evidence against · 2
Can we know if the universe is flat?
2017
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Can we know if the universe is flat?. (2017). physics.stackexchange.com. https://physics.stackexchange.com/questions/316850/can-we-know-if-the-universe-is-flat

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More for · 3
Ancient light : our changing view of the universe
1991
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1948-, L. A. P. & Origins, L. A. P. 1. (1991). Ancient light : our changing view of the universe. archive.org. https://archive.org/details/ancientlightourc00ligh

The big bang
2006
Get citation
Fleisher, P. (2006). The big bang. archive.org. https://archive.org/details/bigbang00flei

LibreTexts: 34.04: Dark Matter and Closure
Get citation
LibreTexts: 34.04%3A Dark Matter and Closure. (n.d.). phys.libretexts.org. https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/34%3A_Frontiers_of_Physics/34.04%3A_Dark_Matter_and_Closure

More against · 1
arXiv: The nearly flat universe
Get citation
arXiv: The nearly flat universe. (n.d.). arxiv.org. https://arxiv.org/abs/gr-qc/0501061

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held for human review17 Oct 2026
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