But the effects of time dilation are still visible today. When we look at distant galaxies, we’re seeing them as they were billions of years ago—closer to the time of the Big Bang.
The light we observe from these galaxies has been traveling through space for so long that it has been stretched by the expansion of the universe, a phenomenon known as redshift.
This redshift isn’t just a stretching of light; it’s also a stretching of time. The farther back in time we look, the more “stretched out” the signals become, showing us that time was moving differently in the early universe.
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