US EditionAre astronomers wrong about dark energy? New study casts doubt on universe’s accelerating expansion
Researchers found a 99.99% statistically confident age-brightness bias in Type Ia supernovas, suggesting dark energy may weaken and cosmic expansion could slow, challenging prior assumptions.
- This year, a study in Monthly Notices of the Royal Astronomical Society presents evidence that cosmic expansion might be slowing, with Young-Wook Lee and Junhyuk Son linking this to Type Ia supernovas' ages.
- Analyzing a sample of 300 galaxies, researchers found luminosity depends on progenitor age, with younger stars dimmer and older ones brighter, building on last year's DESI 3D map hinting dark energy weakens.
- Independent confirmations and contested refutations show the team reports about 99.99% confidence in the age–brightness relation, and two independent teams in the U.S. and China confirmed it, critics including Riess and Scolnic challenged the premise.
- Experts including Dragan Huterer cautioned that extraordinary claims require extraordinary evidence, while Lee acknowledged they must convince the supernova cosmology community amid anticipated debate in the near future.
- Future LSST data are expected to enable a more direct cosmological test within three or five years, potentially confirming a significant shift in understanding dark energy.
6 Articles
6 Articles
Is the universe’s expansion slowing down? Astronomers cast doubt on Nobel-winning theory
By Jacopo Prisco, CNN (CNN) — The universe’s expansion might not be accelerating but slowing down, a new study suggests. If confirmed, the finding would upend decades of established astronomical assumptions and rewrite our understanding of dark energy, the elusive force that counters the inward pull of gravity in our universe. Two separate teams of astronomers, while observing bright, exploding stars called Type 1a supernovas, put forth the idea…
Is the universe’s expansion slowing down? Astronomers cast doubt on Nobel-winning theory | News Channel 3-12
By Jacopo Prisco, CNN (CNN) — The universe’s expansion might not be accelerating but slowing down, a new study suggests. If confirmed, the finding would upend decades of established astronomical assumptions and rewrite our understanding of dark energy, the elusive force that counters the inward pull of gravity in our universe. Two separate teams of astronomers, while observing bright, exploding stars called Type 1a supernovas, put forth the idea…
Is the universe’s expansion slowing down? Astronomers cast doubt on Nobel-winning theory
By Jacopo Prisco, CNN (CNN) — The universe’s expansion might not be accelerating but slowing down, a new study suggests. If confirmed, the finding would upend decades of established astronomical assumptions and rewrite our understanding of dark energy, the elusive force that counters the inward pull of gravity in our universe. Two separate teams of astronomers, while observing bright, exploding stars called Type 1a supernovas, put forth the idea…
Is the universe’s expansion slowing down? Astronomers cast doubt on Nobel-winning theory
By Jacopo Prisco, CNN (CNN) — The universe’s expansion might not be accelerating but slowing down, a new study suggests. If confirmed, the finding would upend decades of established astronomical assumptions and rewrite our understanding of dark energy, the elusive force that counters the inward pull of gravity in our universe. Two separate teams of astronomers, while observing bright, exploding stars called Type 1a supernovas, put forth the idea…
Is the universe’s expansion slowing down? Astronomers cast doubt on Nobel-winning theory
By Jacopo Prisco, CNN (CNN) — The universe’s expansion might not be accelerating but slowing down, a new study suggests. If confirmed, the finding would upend decades of established astronomical assumptions and rewrite our understanding of dark energy, the elusive force that counters the inward pull of gravity in our universe. Two separate teams of astronomers, while observing bright, exploding stars called Type 1a supernovas, put forth the idea…
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