Astronomy & Space Science · AST-799
The Hubble Tension, Systematics & New-Physics Proposals: Observation, Measurement & Evidence
A source-linked chapter designed to teach the subject itself, not a generic lesson template.
Chapter map
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Evidence
Evidence for The Hubble Tension, Systematics & New-Physics Proposals
NASA's current overview describes a continuing discrepancy between late-distance-ladder and CMB-derived values. Independent methods are improving, but no single explanation has achieved broad empirical confirmation.
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References & evidence
Source library for this chapter
These are the linked sources supporting the verified claims used throughout the lesson.
- 01Hubble Constant and TensionOpen source ↗
NASA Science
- 02DESI DR2 Results GuideOpen source ↗
DESI Collaboration
View claim-by-claim traceability3 verified claims
The Hubble tension is the persistent mismatch between some late-universe determinations of the present expansion rate and the lower value inferred from early-universe data such as the CMB within the standard ΛCDM model.
supported · checked Sep 22, 2026A calibration bias can shift local distances and therefore H0, while new early-universe physics can alter the sound horizon used to infer distances from the CMB and BAO.
supported · checked Sep 22, 2026NASA's current overview describes a continuing discrepancy between late-distance-ladder and CMB-derived values.
supported · checked Sep 22, 2026