Study Dates Oldest Star at 13.73 Billion Years, Backing 13.8 Billion-Year Universe
Updated
Updated · Universe Today · Jul 14
Study Dates Oldest Star at 13.73 Billion Years, Backing 13.8 Billion-Year Universe
1 articles · Updated · Universe Today · Jul 14
Summary
A University of Portsmouth-led study dated the oldest star in a vetted Milky Way sample to about 13.73 billion years, implying a universe roughly 13.8 billion years old.
The estimate came from 247,103 stars analyzed with LAMOST spectroscopy and Gaia distances; after quality and chemistry checks, 155,600 stars were kept, with emphasis on late-life stars whose ages are easier to pin down.
That result closely matches the age inferred from the cosmic microwave background and undercuts Hubble-tension fixes that require a much younger universe near 12.9 billion years.
The mismatch over today's expansion rate remains unresolved, but the stellar dating casts doubt on early-universe new-physics explanations that would make the oldest stars older than the universe itself.
With ancient stars invalidating young-universe theories, is our understanding of cosmic expansion fundamentally flawed?
As dueling cosmic measurements create a 'Hubble Tension,' what 'new physics' is needed to unify them?
If new supernova analysis questions cosmic acceleration, could the mysterious 'dark energy' not exist at all?
13.8 Billion Years and Counting: Stellar Census, Pristine Stars, and the Future of Cosmology
Overview
In July 2026, new astronomical research used advanced observational data and precise analytical techniques to measure the ages of stars, especially subgiant and giant stars. This significant stellar census provided robust, independent verification that strongly reinforces the universe’s age estimate of 13.8 billion years. These findings offer crucial insights into cosmic evolution and the timeline of the cosmos, while also providing a solid foundation for cosmological models. The improved methodologies mark a leap forward in astrophysical precision, helping scientists better understand the universe’s history and strengthen the reliability of current cosmological theories.