Hubble tension

The value of H0, which encodes the current expansion rate of the universe, has two values: one from near-universe measurements and one from cosmic microwave background measurements combined with the Lambda-CDM model. These two values disagree to a high degree of statistical confidence (5.7σ). Are there systematic measurement errors? A problem in the otherwise widely successful model?

Open the “Cosmology and general relativity” section on Wikipedia →

Source: List of unsolved problems in physics (CC BY-SA 4.0)