Universe's Accelerating Expansion Challenges Current Models

Discrepancies in Expansion Rate Measurements, Known as the Hubble Tension, Prompt New Research for Explanations

Scientists have discovered that the universe's expansion is accelerating, likely due to dark energy, as described in the Lambda CDM model.
The Hubble tension, a discrepancy in expansion rate measurements, challenges current models and spurs ongoing research for explanations.
Dark energy, the source of this acceleration, could be explained by a cosmological constant, a property of spacetime that contributes to the universe's expansion.
The Lambda CDM model, the leading theory of cosmology, explains observations of the cosmic microwave background and the universe's expansion rate, but inconsistencies known as the Hubble tension have been found.
New research suggests that modifications to the Lambda CDM model or new theories about the universe's workings are needed to explain the Hubble tension.