Astronomy & Space Science · AST-709
Temperature Anisotropies: Observation, Measurement & Evidence
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Evidence
Evidence for Temperature Anisotropies
COBE first detected large-angle anisotropy; WMAP and Planck mapped the pattern at much finer resolution. The observed angular power spectrum shows the correlations expected from primordial fluctuations evolved through early-universe plasma physics.
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- 01The Big Bang — SummaryOpen source ↗
OpenStax Astronomy 2e · Mar 9, 2022
View claim-by-claim traceability3 verified claims
The CMB is almost uniform but contains temperature anisotropies at roughly the level of parts in one hundred thousand.
supported · checked Sep 22, 2026Photons emerging from different early density regions experience different gravitational redshifts, intrinsic temperatures, and Doppler shifts.
supported · checked Sep 22, 2026COBE first detected large-angle anisotropy; WMAP and Planck mapped the pattern at much finer resolution.
supported · checked Sep 22, 2026