Quasar 'clocks' show the universe was five times slower soon after the BigBang NatureAstronomy
"Looking back to a time when the universe was just over a billion years old, we see time appearing to flow five times slower," said lead author of the study, Professor Geraint Lewis from the School of Physics and Sydney Institute for Astronomy at the University of Sydney.
"This expansion of space means that our observations of the early universe should appear to be much slower than time flows today.Previously, astronomers have confirmed this slow-motion universe back to about half the age of the universe using—massive exploding stars—as"standard clocks." But while supernovae are exceedingly bright, they are difficult to observe at the immense distances needed to peer into the early universe.
"What we have done is unravel this firework display, showing that quasars, too, can be used as standard markers of time for theProfessor Geraint Lewis in the Sydney Institute for Astronomy in the School of Physics at the University of Sydney. Credit: The University of Sydney
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