Add Yahoo as a preferred source to see more of our stories on Google. A new “stochastic siren” method uses the gravitational-wave background to sharpen estimates of the Hubble constant. (CREDIT: NASA) ...

Hubble’s measurements of today’s expansion rate do not match the rate that was expected based on how the Universe appeared shortly after the Big Bang over 13 billion years ago. Using new data from the ...

A plot of BAO Amplitude vs. Baryon Fraction. Credit: Alex Krolewski et al, Physical Review D (2025). DOI: 10.1103/PhysRevD.111.063526 Researchers from the University of Waterloo have proposed a new ...

A subtle gravitational-wave “hum” from merging black holes may help settle the cosmic fight over how fast the universe is ...

Scientists have made a new calculation of the speed at which the universe is expanding, using the data taken by the powerful new James Webb Space Telescope on multiple galaxies. Webb’s image of one ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Robert Lea New ...

Astronomers have long known the universe is expanding—but exactly how fast remains one of the biggest mysteries in cosmology. Different techniques for measuring the Hubble constant stubbornly disagree ...

This illustration shows the three basic steps astronomers use to calculate how fast the universe expands over time, a value called the Hubble constant. All the steps involve building a strong "cosmic ...

Scientists propose a gravitational-wave method called the stochastic standard siren to measure the Hubble constant, offering an independent way to examine the universe’s expansion and the Hubble ...

A 60-year-old prediction just helped astronomers measure the expansion of the universe. Astronomers recently used the light of a distant supernova to calculate how fast the universe is expanding. But ...

An analysis has produced the most precise summation to date of the universe’s dark energy and dark matter contents. Reading time 3 minutes A new analysis of more than 1,500 supernovae has put fresh ...

To turn that distance into a Hubble constant, you also need the event’s redshift, which is tied to how fast the source is receding due to cosmic expansion. Standard approaches get the redshift by ...