The idea that time appears to run more slowly in the past seems odd, but it's actually a well-accepted consequence of the universe expanding from the big bang.
at the University of Auckland, New Zealand, have detected a more extreme version earlier in the universe., which are objects at the centre of some galaxies comprised of a supermassive black
hole surrounded by a disc of hot plasma that spit out high energy particles. They are among the oldest objects in the universe, with the earliest we have seen emerging just 600 million years after the big bang. This age in theory makes quasars suitable for probing time dilation in the early universe, but their unpredictable nature makes that difficult, unlike with supernovae.
“Imagine you’ve got a firework, it’s bright but it fades away over a few seconds, that’s like a supernova,” Lewis says. “Now imagine you’re looking at a firework display, the brightness varies and there can be lots of stuff going on.” By watching lots of firework displays, however, a pattern emerges of how they might behave, he says.Untangle the weirdness of reality with our monthly newsletter.That is exactly what Lewis and Brewer did by analysing the data of 190 quasars.
“The importance of the Lewis and Brewer paper is to demonstrate that quasars, for a long time the ‘ultimate cosmological sources’, also display a time dilation, as expected by theory and previously demonstrated by other objects,” says
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