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the claim

The temperature of the CMB corresponds to a blackbody spectrum of 2.725 Kelvin

the verdict
SUPPORTED
the evidence backs this
Recorded sources
3 sources for · 0 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 temperature of the CMB corresponds to a blackbody spectrum of 2.725 Kelvin?

Yes. Extensive astrophysical measurements, most notably from the COBE satellite, confirm that the cosmic microwave background exhibits a blackbody spectrum corresponding to a temperature of approximately 2.725 Kelvin.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked

The analysis

The claim is a specific, empirical scientific statement about the temperature and spectral nature of the cosmic microwave background. Papers such as [5] and [10] directly report the measured blackbody temperature of the CMB near 2.73 K, and modern measurements refine this to 2.725 K as supported by subsequent literature like [2]. There are no papers refuting this well-established cosmological consensus.

Evidence for · 3
Extragalactic background light measurements and applications.
2016
Notes that the cosmic microwave background remains the best-measured spectrum with high accuracy.
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A, C. (2016). Extragalactic background light measurements and applications.. doi.org. https://doi.org/10.1098/rsos.150555

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More for · 2
Scientific results from the Cosmic Background Explorer (COBE).
1993
Provides foundational satellite measurements from FIRAS showing the CMB fits a blackbody spectrum closely matching approximately 2.73 Kelvin.
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CL, B., NW, B., ES, C., MG, H., T, K., JC, M., Jr, M. S., TL, M., RA, S., RF, S., GF, S., R, W., & EL, W. (1993). Scientific results from the Cosmic Background Explorer (COBE).. doi.org. https://doi.org/10.1073/pnas.90.11.4766

The microwave background anisotropies: observations.
1998
Discusses the blackbody nature of the CMBR spectrum and cites the temperature around 2.73 K.
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D, W. (1998). The microwave background anisotropies: observations.. doi.org. https://doi.org/10.1073/pnas.95.1.29

What does the evidence say?

The claim is a specific, empirical scientific statement about the temperature and spectral nature of the cosmic microwave background. Papers such as [5] and [10] directly report the measured blackbody temperature of the CMB near 2.73 K, and modern measurements refine this to 2.725 K as supported by subsequent literature like [2]. There are no papers refuting this well-established cosmological consensus.

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 8104 Aug 2026
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