The Early Universe's Slow Motion Revelation

A new study has provided evidence for time dilation in the early universe by observing quasars. Quasars, powered by supermassive black holes, have fluctuations in intensity that depend on the size of the active galactic nucleus (AGN). By analyzing 190 distant quasars at different wavelengths, researchers found a correlation between distance and the rate of fluctuations, indicating time dilation. The study extended these observations back to when the universe was just a billion years old, with a second from that epoch appearing to last five seconds from our perspective. This supports the standard cosmological model and general relativity.