Hubble Rate Recalibrated: New Study Offers Most Precise Measure of Universe’s Expansion
An international team of 40 scientists has published the most precise measurement to date of how fast the universe is expanding. According to their new study, the expansion rate of the universe is 73.5 kilometers per second per megaparsec.
The uncertainty in the measurement is estimated at ±0.81, which is less than one percent. As a result, it is now considered one of the most accurate determinations of the Hubble Constant so far.
One of the authors of the study is Dr. Syed Ashraf Uddin, Associate Professor at Independent University, Bangladesh (IUB). He is also a core group member of the university’s Center for Astronomy, Space Science and Astrophysics (CASA).
The research team, consisting of around 40 scientists, is known as the H0 Distance Network Collaboration. Their paper, titled “The Local Distance Network: A Community Consensus Report on the Measurement of the Hubble Constant at ~1% Precision,” has been published in the journal Astronomy & Astrophysics.
For a long time, scientists have debated the value of the universe’s expansion rate, commonly referred to as the Hubble Constant (H₀). A discrepancy between results derived from early-universe radiation analysis and those based on observations of nearby galaxies has led to what scientists call the Hubble Tension.
Dr. Ashraf Uddin noted that similar results have been obtained using different measurement methods. Therefore, the discrepancy cannot simply be explained as an error in any one method. Instead, it may point to deeper, unknown aspects of physics.
In this study, instead of analyzing methods separately, researchers used an integrated framework referred to as the “Distance Network.” This approach combines data from various observational techniques to produce comparative results.
He added that their goal was to create a transparent and flexible framework for future researchers. The findings are expected to support analysis of data from next-generation powerful telescopes.
Meanwhile, Dr. Khan Mohammad Bin Asad, Assistant Professor and Director of CASA, said that the center is working to connect Bangladeshi researchers with the global astronomy community. This initiative is increasing opportunities for young researchers to participate in modern scientific studies.
CASA, the country’s first research center dedicated to astronomy and astrophysics, was established in 2024. Recently, a small-scale transient array radio telescope has been installed on the IUB campus, marking a new chapter in formal space research in Bangladesh.
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