The Hubble constant, within cosmological research, denotes the present-day proportionality factor relating the recession velocity of extragalactic objects to their proper distance in the expanding universe, and thus operationally defines the local expansion rate. As a research area, work on the Hubble constant encompasses precision measurement via distance-ladder methods (e.g., Cepheids, Type Ia supernovae), early-universe inferences from cosmic microwave background anisotropies and baryon acoustic oscillations, and associated statistical and systematic error analyses. This field currently focuses on resolving tensions between independent determinations, refining calibration strategies, and constraining cosmological models and new physics through improved estimates of this parameter.
Drawing together leading experts from across the field, an international collaboration of cosmologists has created a unified approach for measuring the value of the Hubble constant. Published in Astronomy & Astrophysics, ...
Douglas Adams told us the answer to life, the universe and everything is 42. If only cosmology were so straightforward. Astronomers have been arguing for years about a number every bit as fundamental, and they still can't ...
Astronomy
Mar 30, 2026
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A team of cosmologists in China has introduced a mathematical framework that investigates two of the deepest mysteries in cosmology at the same time. Publishing their research in The Astrophysical Journal, Yun Chen and colleagues ...
Researchers from the University of Bologna and the Leibniz Institute for Astrophysics Potsdam (AIP) along with other institutes have proposed a new way to address the Hubble tension by comparing estimates of the universe's ...
Astronomy
Mar 5, 2026
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We have known for several decades that the universe is expanding. Scientists use multiple techniques to measure the present-day expansion rate of the universe, known as the Hubble constant. These methods are internally consistent ...
Astronomy
Feb 24, 2026
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That the universe is expanding has been known for almost a hundred years now, but how fast? The exact rate of that expansion remains hotly debated, even challenging the standard model of cosmology. A research team at the ...
Astronomy
Feb 19, 2026
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It's well established that the universe is expanding, but there's serious disagreement among scientists over how fast it's happening.
Astronomy
Feb 15, 2026
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A Simon Fraser University cosmologist believes his team's new research may bring them a step closer to cracking one of science's biggest questions—the Hubble tension.
Astronomy
Jan 20, 2026
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One of the most stubborn issues in cosmology today concerns the universe's rate of expansion. Scientists know it's expanding, but defining the rate of that expansion is challenging. The rate of expansion is called the Hubble ...
Astronomy
Jan 19, 2026
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There is an important and unresolved tension in cosmology regarding the rate at which the universe is expanding, and resolving this could reveal new physics. Astronomers constantly seek new ways to measure this expansion ...
Astronomy
Dec 5, 2025
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