AI summary: Time appears to have moved slower in the early universe, a direct result of its expansion since the big bang. This phenomenon, known as time dilation, has been observed in distant supernovae. Now, researchers Geraint Lewis and Brendon Brewer have detected a more extreme version in quasars, some of the oldest objects in the universe. By analysing data from 190 quasars, they found that the earliest quasar appeared to run five times more slowly than today’s quasars, marking our earliest observation of cosmological time dilation.