- #1
pinball1970
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- TL;DR
- This paper uses measurements from the Gaia telescope on stellar data from the milky way, to estimate the age of the universe and the Hubble constant and points to the CMBR number.
This study uses data from the Gaia telescope launched in 2013 which measured stellar ages of stars greater than 12.5 gy.
This set a lower limit on the age of the universe, if there are stars >12.5 gy then the universe cannot be younger than this.
This impacts on the the Hubble constant, if the universe is older, the constant is lower.
That is my understanding from reading around (phys.org, wiki, Ai) but @Ibix @Bandersnatch @Orodruin and @Drakkith will have a professional view.
https://www.aanda.org/articles/aa/full_html/2026/03/aa57038-25/aa57038-25.html
This set a lower limit on the age of the universe, if there are stars >12.5 gy then the universe cannot be younger than this.
This impacts on the the Hubble constant, if the universe is older, the constant is lower.
That is my understanding from reading around (phys.org, wiki, Ai) but @Ibix @Bandersnatch @Orodruin and @Drakkith will have a professional view.
https://www.aanda.org/articles/aa/full_html/2026/03/aa57038-25/aa57038-25.html