Steve HermanScientists say quasars demonstrate the early universe's "time dilation," when time then passed only about a fifth as quickly as it does today. https://www.nature.com/articles/s41550-023-02029-2
Detection of the cosmological time dilation of high-redshift quasars - Nature Astronomy
A Bayesian-based analysis of 190 cosmologically distant quasars, photometrically observed over two decades, has revealed the long-expected presence of cosmic time dilation owing to the expansion of space imprinted on their variability.
Joe Heafner