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 ...

New research suggests that a troubling disparity in the rate of expansion of the universe, known as the Hubble constant, may arise from the fact Earth sits in a vast underdense region of the cosmos.

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 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 ...

Astronomers using NASA’s Hubble Space Telescope have discovered that the universe is expanding 5 percent to 9 percent faster than expected. “This surprising finding may be an important clue to ...

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 ...

Lensing in action: A montage of eight time-delay gravitational lens systems. There is an entire galaxy at the centre of each image, and the bright points in rings around them are gravitationally ...

For decades, the cosmological field was working under the assumption that, after the universe began in a hot dense soup of energy that expanded in the Big Bang, it continued to expand, forming the ...