Astronomy & Space Science · AST-707
Temperature Anisotropies: Structures & Vocabulary
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Structure
Structure of Temperature Anisotropies
Anisotropies are analyzed statistically across angular scales rather than interpreted as individual hot and cold objects. Large angular scales reflect primordial conditions and integrated effects, while smaller scales encode acoustic physics, diffusion damping, and later gravitational lensing.
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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