New observations show the universe was five times slower soon after the Big Bang, proving Einstein right once again.
Time dilation refers to the phenomenon whereby different objects experience time differently based on their relative speeds or gravitational potentials. This is observable, for example, in the fact that geosynchronous satellites experience time differently from a clock on Earth.
"This expansion of space means that our observations of the early universe should appear to be much slower than time flows today. In this paper, we have established that back to about a billion years after the Big Bang."Before the new study, scientists had used supernovae to measure time dilation dating back to roughly half the age of the universe.
"Where supernovae act like a single flash of light, making them easier to study, quasars are more complex, like an ongoing firework display," Professor Lewis explained. "What we have done is unravel this firework display, showing that quasars, too, can be used as standard markers of time for the early universe."
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