Cosmological concept · Cosmology
The Hubble Tension
Cosmology & UniverseScientific Debate
Definition
The unresolved disagreement between measurements of the Hubble constant from the early and the local Universe.
Scientific overview
Measurements of the expansion rate anchored in the early Universe (the CMB) give about 67 km/s/Mpc, while direct measurements in the nearby Universe give about 73 km/s/Mpc. The gap is now statistically significant and has resisted explanation as a simple error.
Open questions
- Is the tension due to measurement systematics or new physics?
- Does it require modifying ΛCDM (e.g. early dark energy)?
Measured by
Related topics
Knowledge connections
- Related toThe Hubble Constant
- Related toThe Hubble Constant
- Part of modelThe Lambda-CDM Model
- Measured byHubble Space Telescope
- Measured byPlanck
- Associated withSH0ES
- Associated withEarly Dark Energy
- Associated withThe History of Cosmology
Sources & references
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
- Planck CollaborationESA Planck mission / Planck Collaboration
Cosmic microwave background maps and the cosmological parameters of the ΛCDM model.