The expanding universe research area investigates the observational and theoretical foundations of cosmic expansion, originating from general relativity and supported by redshift–distance relations, cosmic microwave background anisotropies, and large-scale structure surveys. It encompasses measurements of the Hubble parameter and its evolution, constraints on dark energy and matter content via cosmological parameters, and tests of the ΛCDM model and its alternatives. Research integrates numerical simulations, precision cosmology, and data from supernovae, baryon acoustic oscillations, and gravitational lensing to characterize the expansion history, probe deviations from general relativity, and refine models of early- and late-time cosmic dynamics.
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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Two new studies have measured the expansion of the universe in our immediate cosmic neighborhood using a novel method that analyzes the motion of two nearby galaxy groups within their surrounding cosmic flow. The results ...
Astronomy
Mar 11, 2026
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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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Dark energy is one of those cosmological features that we are still learning about. While we can't see it directly, we can most famously observe its effects on the universe—primarily how it is causing the expansion of the ...
Astronomy
Feb 17, 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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The standard cosmological model (present-day version of "Big Bang," called Lambda-CDM) gives an age of the universe close to 13.8 billion years and much younger when we explore the universe at high-redshift. The redshift ...
The NASA/ESA/CSA James Webb Space Telescope has topped itself once again, delivering on its promise to push the boundaries of the observable universe closer to cosmic dawn with the confirmation of a bright galaxy that existed ...
Astronomy
Jan 28, 2026
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