For the first time, astronomers have been able to observe ‘Time Dilation’ in the cosmos. They have watched the distant universe running in slow motion, marking the first time that the weird effect predicted by Einstein more than a century ago has been observed in the early cosmos. Time dilation refers to the seemingly odd fact that time passes at different rates for different observers, depending on their relative motion or positions in a gravitational field. Scientists found that events appeared to unfold five times slower when the universe was a mere 1 billion years old, or about a tenth of its present age, because of the way the expansion of the universe stretches time.

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