New Studies Suggest Slower Expansion Rate in Local Universe

Recent research has provided new measurements of the universe’s expansion rate, addressing a long-standing difference between local and early-universe estimates known as the “Hubble tension.” These findings are based on studies published in March 2026 that examined the movement of nearby galaxy groups using a novel approach.

The Hubble constant is the value used to describe how quickly the universe is expanding at present, and it is measured in kilometers per second per megaparsec. Historically, local measurements and early-universe predictions have produced conflicting values for this constant, leading to ongoing debate within the scientific community.

In March 2026, two independent studies applied a new method to analyze the motions of galaxy groups in the local universe. According to these studies, the local expansion rate is slower than what earlier local measurements had indicated.

These new results bring the locally measured expansion rate closer to the value predicted by observations of the early universe, such as those derived from the cosmic microwave background. This alignment reduces the gap between different measurement techniques that has persisted for years.

What the numbers show

• The Planck CMB data predicts a Hubble constant of approximately 67 km/s/Mpc
• A 2025 study using a galaxy cluster found a local Hubble constant of 76.5 km/s/Mpc
• Gravitational lensing measurements in 2025 produced a local value in tension with early-universe estimates

Previous local measurements, such as those using gravitationally lensed quasars in 2025, resulted in a Hubble constant that was higher than early-universe predictions. This difference contributed to the ongoing Hubble tension, which refers to the mismatch between local and early-universe expansion rate values.

Another 2025 study calibrated the cosmic distance ladder using a galaxy cluster located about 320 million light-years away. This research determined a Hubble constant of 76.5 km/s/Mpc for the local universe, a value that did not match the lower figure from early-universe data.

The persistent discrepancy between these two approaches has been a central issue in cosmology. The new 2026 studies, by bringing local measurements closer to early-universe predictions, represent a step toward resolving this difference.

Despite the progress made by these recent studies, the Hubble constant remains a key focus of cosmological research. The ongoing comparison of measurement techniques continues to shape scientific understanding of the universe’s expansion.

* This article is based on publicly available information at the time of writing.