An international collaboration of astronomers has achieved the most precise direct measurement to date of the expansion rate of the nearby Universe. The result shows a persistent mismatch between measurements based on the nearby Universe and predictions derived from the early Universe, known as the Hubble tension.
SourceAssociation of Universities for Research in Astronomy (AURA)·JournalAstronomy and Astrophysics·DateApr 10, 2026
A Simon Fraser University researcher believes his team's new research may bring them closer to cracking the Hubble tension, a decades-old question about the universe's expansion rate. The theory centers on primordial magnetic fields, which could have accelerated recombination and affected the value of the Hubble constant.
The Atacama Cosmology Telescope's sixth and final data release confirms the 'Hubble tension' and rules out extended cosmological models, providing new insights into the Universe's evolution and current state. ACT's observations offer a cleaner starting point for future research.
SourceSissa Medialab·JournalJournal of Cosmology and Astroparticle Physics·TypeData/statistical analysis·DateNov 24, 2025
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Researchers suggest our galaxy might sit in a large, local void that makes the cosmos expand faster here than elsewhere. The 'sound of the Big Bang' supports this idea by distorting baryon acoustic oscillations, which provide a standard ruler for charting cosmic expansion history.
A team led by UChicago scientist Wendy Freedman has used the James Webb Space Telescope to find no evidence of tension in the Hubble Constant, resolving a decade-long conflict. The new data strengthens the Standard Model of the universe, suggesting that the Hubble Constant may not be the source of inconsistencies.
SourceUniversity of Chicago·JournalThe Astrophysical Journal·DateJun 3, 2025
The Atacama Cosmology Telescope (ACT) collaboration has produced the clearest images yet of the universe’s infancy. These new images show subtle variations in density and velocity of gases in the young universe, helping scientists answer longstanding questions about the universe’s origins.
New measurements of the Hubble constant support a faster-than-expected Universe expansion rate, challenging current understanding of physics. A precise distance measurement to the Coma Cluster provides the foundation for this new result.
SourceDuke University·JournalThe Astrophysical Journal Letters·TypeData/statistical analysis·DateJan 16, 2025
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Edwin Hubble discovered a new universe by analyzing the brightness of stars, revealing that our galaxy is just one of billions in the universe. His findings showed that galaxies move away from each other at faster speeds with greater distances.
The new Webb Space Telescope study confirms Hubble's expansion rate measurements, offering a crucial cross-check to address the mismatch in measurements. The discrepancy remains unexplained even by the best cosmology models, suggesting that our understanding of the universe may be incomplete.
SourceJohns Hopkins University·JournalThe Astrophysical Journal·TypeObservational study·DateDec 9, 2024
Researchers at the Flatiron Institute and colleagues used AI-powered approach, SimBIG, to estimate five cosmological parameters with precision. The method significantly improved previous results, yielding less than half the uncertainty and closely agreeing with other estimates based on observations.
SourceSimons Foundation·JournalNature Astronomy·TypeComputational simulation/modeling·DateAug 26, 2024
A new study has sorted through models attempting to solve the cosmological tension, a discrepancy between two ways of calculating the universe's expansion. Three models that were previously viable solutions were excluded by the new data, while others reduced the tension but not solved it.
SourceSissa Medialab·JournalJournal of Cosmology and Astroparticle Physics·TypeData/statistical analysis·DateApr 19, 2024
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A new study by EPFL researchers has calibrated the best cosmic yardsticks to unprecedented accuracy, further amplifying the Hubble tension. The Hubble constant is measured in kilometers per second per megaparsec and has puzzled astrophysicists and cosmologists worldwide.
SourceEcole Polytechnique Fédérale de Lausanne·JournalAstronomy and Astrophysics·TypeData/statistical analysis·DateApr 4, 2023
Astronomers have cataloged over 51,863 Lyman-alpha-emitting galaxies, 123,891 star-forming galaxies, and 4,976 active galactic nuclei using HETDEX's spectroscopic data. The survey is a non-targeted, moon-sized survey that collects spectra from 35,000 fiber optic cables, providing a unique dataset for future galaxy mapping.
SourceUniversity of Texas at Austin, Texas Advanced Computing Center·JournalThe Astrophysical Journal·TypeExperimental study·DateFeb 9, 2023
Researchers Martin S. Sloth and Florian Niedermann introduce New Early Dark Energy (NEDE) as a solution to the Hubble tension problem, suggesting a phase transition in dark energy that explains different measurement results for the universe's expansion rate.
SourceUniversity of Southern Denmark·JournalPhysics Letters B·TypeComputational simulation/modeling·DateFeb 1, 2023
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Researchers discovered a previously unnoticed mathematical property that could allow for a faster expansion rate while preserving other predictions. This finding suggests the existence of a 'mirror world' with similar but invisible particles interacting only through gravity.
SourceUniversity of New Mexico·JournalPhysical Review Letters·TypeComputational simulation/modeling·DateMay 19, 2022
Researchers confirm a rare and massive black hole merger with an eccentric orbit, shedding light on the formation of supermassive black holes in dense star clusters. The study's findings have significant implications for our understanding of black hole dynamics and the evolution of galaxies.
SourceRochester Institute of Technology·JournalNature Astronomy·DateJan 20, 2022
Researchers Eoin Ó Colgáin and Mohammad Mehdi Sheikh-Jabbari found that the approach may not be universally applicable across all models. Their study evaluates Gaussian Processes using the Hubble constant, highlighting a mismatch between smaller-scale and overall measurements.
SourceSpringer·JournalThe European Physical Journal C·DateNov 15, 2021
Astronomer Wendy Freedman's review paper suggests that recent observations are closing the gap between different measurement methods for the Hubble constant. The latest data from red giant stars and cosmic microwave background experiments agree within 1% of each other, indicating no need for fundamental new physics.
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Researchers used combined signals from binary neutron star mergers to study ultra-dense matter and constrain the Hubble constant. The analysis, led by Tim Dietrich, provided new insights into neutron star equation of state and expansion rate of the Universe.
SourceAmerican Association for the Advancement of Science (AAAS)·JournalScience·DateDec 17, 2020
A new study using multi-messenger astronomy has estimated the radius of a typical neutron star to be around 11.75 kilometers and provided a novel calculation of the Hubble constant, which indicates the rate of universe expansion. The researchers' analysis combined gravitational-wave signals and electromagnetic emissions from neutron st...
SourceDOE/Los Alamos National Laboratory·JournalScience·DateDec 17, 2020
A new study by a University of Oregon physicist estimates the age of the universe at 12.6 billion years using a refined distance-calculation technique. The approach recalibrates a distance-measuring tool known as the baryonic Tully-Fisher relation independently of Hubble's constant.
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A new study using international radio telescope data reveals galaxies are nearer than predicted, exacerbating a discrepancy in the Hubble Constant measurement. This finding bolsters the need to revise the standard cosmological model of the Universe.
Physicists use two types of measurements to calculate the universe's expansion rate, but their results don't coincide. The Hubble constant value differs by 7% between late and early Universe measurements.
SourceSpanish Foundation for Science and Technology·JournalNature Astronomy·DateNov 18, 2019
A new measurement of the Hubble constant has been made using light from extremely distant galaxies, estimating a value of 76.8 kilometers per second per megaparsec. The result is comparable to previous estimates but differs significantly from other methods, sparking debate about potential new physics beyond our current understanding.
SourceUniversity of California - Davis·JournalMonthly Notices of the Royal Astronomical Society·DateOct 23, 2019
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Scientists have developed a new technique for measuring the expansion of the universe using gravitational lensing, which yields a somewhat higher Hubble Constant value compared to standard measurements. The method provides a valuable alternative approach to addressing the long-standing discrepancy in the Hubble Constant's value
SourceAmerican Association for the Advancement of Science (AAAS)·JournalScience·DateSep 12, 2019
A new method using red giant stars has measured the universe's expansion rate at 69.8 kilometers per second per megaparsec, settling between previous values of 74.0 km/s/Mpc and 67.4 km/s/Mpc. The result may indicate that the standard model of the universe is not yet complete.
SourceCarnegie Institution for Science·JournalThe Astrophysical Journal·DateJul 16, 2019
Astronomers have made a new measurement of the Hubble constant using red giant stars, indicating an expansion rate of around 70 km/sec/Mpc. This measurement falls in the center of a hotly debated question and may lead to a new interpretation of the universe's fundamental properties.
Researchers pin down Hubble constant value between 65.3 and 75.6 km/s/Mpc using gravitational wave signals and radio images. This method relies on a single merger event, which is remarkable given the cosmological models' limitations.
SourcePrinceton University·JournalNature Astronomy·DateJul 9, 2019
Astronomers using NASA's Hubble Space Telescope have strengthened the case for new theories to explain the forces shaping the cosmos. The latest Hubble measurements suggest a faster expansion rate in the modern universe, contradicting expectations based on early universe observations.
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A new study using NASA's Hubble Space Telescope confirms the universe is expanding about 9% faster than expected. The measurements, published April 25 in the Astrophysical Journal Letters, strengthen the cosmic distance ladder and calculate the Hubble constant with increased precision.
Measurements of gravitational waves from binary neutron stars will definitively resolve the debate on the universe's expansion rate. By observing 50 binary neutron stars over the next decade, scientists can calculate the Hubble constant accurately, resolving the conflict between conflicting measurements.
SourceSimons Foundation·JournalPhysical Review Letters·DateFeb 14, 2019
Researchers from UCL and Flatiron Institute develop technique to calculate gravitational wave data, enabling accurate measurement of Hubble constant. By observing 50 binary neutron stars over the next decade, scientists can resolve the long-standing debate on the universe's expansion rate.
SourceUniversity College London·JournalPhysical Review Letters·DateFeb 14, 2019
A team of UCLA astronomers has developed a new method to measure the universe's expansion rate, using double-image quasars to produce an estimate of the Hubble constant. The study's findings suggest that the universe is expanding at a speed of about 72.5 kilometers per second per megaparsec.
SourceUniversity of California - Los Angeles·JournalMonthly Notices of the Royal Astronomical Society·DateJan 22, 2019
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A new study predicts that gravitational wave readings from neutron star collisions can accurately measure the Hubble constant, improving current disputed results. With 25 readings, accuracy will reach 3%, narrowing to 1% with 200 readings.
Researchers propose using gravitational waves to estimate the Hubble constant and measure the rate of the expanding universe. By detecting gravitational waves from rare black hole-neutron star binary systems, scientists can obtain an independent and precise measurement of their distance and velocity.
SourceMassachusetts Institute of Technology·JournalPhysical Review Letters·DateJul 12, 2018
A new study by UW-Madison undergraduate Ben Hoscheit confirms the idea that our galaxy lives in an enormous void, seven times larger than average. The findings help ease tension between different measurements of the Hubble Constant, resolving a long-standing discrepancy among cosmologists.
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The Hubble Constant measurement by the H0LiCOW collaboration hints at 'new physics' beyond the standard model of cosmology. The team used gravitational lenses to measure the universe's expansion rate, which is crucial for confirming or refuting the current picture of dark energy and dark matter.
SourceUniversity of California - Davis·JournalMonthly Notices of the Royal Astronomical Society·DateJan 26, 2017
Astronomers using the Hubble Space Telescope have made an independent measurement of the universe's expansion rate, consistent with earlier findings but in disagreement with measurements from the early Universe. The study uses galaxies as giant gravitational lenses to determine the Hubble constant to a high precision.
SourceESA/Hubble Information Centre·JournalMonthly Notices of the Royal Astronomical Society·DateJan 26, 2017
The H0LiCOW collaboration has made a new measurement of the Hubble constant using quasars and gravitational lensing. The result agrees with recent independent studies but disagrees significantly with cosmic microwave background measurements, potentially indicating new physics beyond the standard cosmological model.
SourceEcole Polytechnique Fédérale de Lausanne·JournalMonthly Notices of the Royal Astronomical Society·DateJan 26, 2017
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Astronomers refine universe's expansion rate with unprecedented accuracy, reducing uncertainty to 2.4 percent. The new value of 73.2 kilometers per second per megaparsec indicates the distance between cosmic objects will double in 9.8 billion years.
SourceNASA/Goddard Space Flight Center·JournalThe Astrophysical Journal·DateJun 2, 2016
A Chinese research team led by Prof. Qing-Guo Huang accurately determined the Hubble constant using Baryon Acoustic Oscillation datasets, achieving a precision of around 1.3%. This result questions the measurement accuracy of Nobel laureate Adam Riess' team.
Researchers have measured the distance to our nearest neighbor galaxy, the Large Magellanic Cloud, using rare eclipsing binaries. The new measurement refines an astronomical calculation that helps measure the expansion of the universe, decreasing uncertainty in the Hubble constant.
SourceCarnegie Institution for Science·JournalNature·DateMar 6, 2013
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A new measurement of the Hubble constant has been made, providing an accurate calculation of how fast the universe is expanding. The method uses data from a survey of over 125,000 galaxies, allowing for precise determination of the universe's growth rate.
SourceInternational Centre for Radio Astronomy Research·JournalMonthly Notices of the Royal Astronomical Society·DateJul 26, 2011
Astronomers using NASA's Hubble Space Telescope have recalculated the universe's expansion rate with unprecedented accuracy, ruling out an alternate theory on dark energy. The new measurement reduces uncertainty by 30% and solidifies understanding of cosmic ingredients.
Freedman, Kennicutt, and Mould's work resolves decades-long debate on the Hubble constant, revealing the universe is 14 billion years old. This finding enables scientists to estimate the density of the universe and understand its fate.
The new value of the Hubble constant is 74.2 kilometers per second per megaparsec, derived from observations of Cepheid variables in seven galaxies using the Hubble Space Telescope. This refined measurement provides a more precise understanding of dark energy's nature and its role in accelerating the universe's expansion.
The Carnegie Hubble Program aims to decrease the uncertainty of the Hubble constant from 10% to 3% by refining distances to galaxies using Cepheid variable stars and Spitzer telescope observations. The team will observe 700 hours of nearby galaxies, correcting for lingering uncertainties and systematic errors.
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Researchers at Ohio State University have discovered a new method for calculating intergalactic distances, which implies that the Hubble constant may be significantly off the mark. The Triangulum Galaxy is estimated to be 15% farther away from our galaxy than previously measured, potentially making the universe 15% bigger and older.