New ultra-precise measurements have confirmed the cosmos is expanding faster than models based on the early universe predict, while a separate study has dramatically shortened estimates of how long the universe itself will last.
Astronomers have long observed a mismatch in the universe’s expansion rate depending on how it is measured. Local observations of nearby galaxies point to a faster rate, while data from the early universe, such as the cosmic microwave background, suggest a slower pace. This longstanding puzzle is known as the Hubble tension.
A major international collaboration, the H0 Distance Network (H0DN), has now produced one of the most accurate local measurements yet. The team combined decades of independent distance measurements—including observations of red giant stars, Type Ia supernovae, and different galaxy types—into a unified “Local Distance Network.” Their result: the Hubble constant stands at 73.50 ± 0.81 kilometers per second per megaparsec, with precision just over 1 percent.
James Webb just uncovered a serious problem with our understanding of the universe.
— Astronomy Vibes (@AstronomyVibes) April 10, 2026
New data from the James Webb Space Telescope confirms a major discrepancy in the universe's expansion rate, suggesting our current understanding of physics may be fundamentally incomplete.
For… pic.twitter.com/x5sWtyHDI7
“This isn’t just a new value of the Hubble constant,” the collaboration notes, “it’s a community-built framework that brings decades of independent distance measurements together, transparently and accessibly.”
The findings, published April 10, 2026, in Astronomy & Astrophysics, strengthen the case that the discrepancy is not due to a simple measurement error.
“This work effectively rules out explanations of the Hubble tension that rely on a single overlooked error in local distance measurements,” the authors conclude. “If the tension is real, as the growing body of evidence suggests, it may point to new physics beyond the standard cosmological model.”
Dr Kathy Romer of the Dark Energy Survey commented, “The universe is not only expanding, but it is expanding faster and faster as time goes by.” She added, “What we’d expect is that the expansion would get slower and slower as time goes by, because it has been nearly 14 billion years since the Big Bang.”
Dark Energy May Be Weakening
Separate research using the largest-ever 3D map of the universe from the Dark Energy Spectroscopic Instrument (DESI) has produced hints that dark energy—the force accelerating cosmic expansion—might not be constant but could be weakening over time.
The DESI team mapped nearly 15 million galaxies and quasars. When combined with cosmic microwave background data and supernova observations, the results fit better with an evolving dark energy model than the standard assumption of a fixed force.
Dr Willem Elbers, a researcher from the Institute for Computational Cosmology at Durham University, said: “For decades, we have relied on a standard model of the universe, but our new data suggests that dark energy might be evolving over time. If this is true, it will change everything we thought we knew about the cosmos.”
Professor Will Percival, co-spokesperson for DESI and an astronomer from the University of Waterloo, added: “We’re guided by Occam’s razor, and the simplest explanation for what we see is shifting. It’s looking more and more like we may need to modify our standard model of cosmology to make these different datasets make sense together—and evolving dark energy seems promising.”
Dr Andrei Cuceu, a researcher at Berkeley Lab who worked on the study, noted: “We’re in the business of letting the universe tell us how it works, and maybe the universe is telling us it’s more complicated than we thought it was.”
Paul Steinhardt, Director of the Princeton Center for Theoretical Science, observed that if dark energy becomes weak enough, scientists say the universe could be pulled together into a Big Crunch “remarkably quickly.”
UNIVERSE MAY END IN BIG CRUNCH
— NewsForce (@Newsforce) April 9, 2026
New data suggests dark energy is weakening, letting gravity eventually collapse the universe.
Expansion will reverse billions of years from now, ending everything in a single point.
Source: NewsForce
Host: @MacyGunnell pic.twitter.com/PxUdo1l9Sg
A related theoretical model led by physicist Henry Tye from Cornell University and collaborators from China and Spain explores one possible scenario. Their calculations suggest the universe has a total lifespan of about 33.3 billion years. With 13.8 billion years already passed, roughly 19.5 billion years would remain. In this model, expansion continues for another 11 billion years before slowing, stopping, and reversing into collapse.
New research suggests our universe might not expand forever as we once thought. Instead, it could eventually collapse in on itself in a “reverse Big Bang,” a scenario scientists call the Big Crunch.
— Astronomy Vibes (@AstronomyVibes) December 21, 2025
For years, astronomers believed the universe would keep growing, driven by a… pic.twitter.com/Fk8wx9Nvbw
These independent lines of inquiry highlight ongoing gaps in our understanding of the universe’s expansion rate and the behavior of dark energy. Future observations from next-generation telescopes are expected to test whether new physics is required to reconcile the data.
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