This artist's concept shows a galaxy with a brilliant quasar, a very bright, distant and active supermassive black hole that is millions to billions of times the mass of the Sun, at its center, seen in this undated handout picture. NASA, ESA and J. Olmsted /Handout via REUTERS
Quasars - among the brightest objects in the universe - were used as a "clock" in the study to measure time in the deep past. Quasars are tremendously active supermassive black holes millions to billions of times more massive than our sun, usually residing at centers of galaxies. They devour matter drawn to them by their immense gravitational pull and unleash torrents of radiation including jets of high-energy particles, while a glowing disk of matter spins around them.
Astrophysicist Geraint Lewis of the University of Sydney in Australia, lead author of the study published in the journal Nature Astronomy, said this continual expansion explains how time flowed more slowly earlier in the universe's history relative to today. By looking at faraway objects, scientists peer back in time because of how long it takes for light to travel through space.
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