When you think about it, time is an arbitrary construct — it's our way of making sense of growing up and growing old. It's only a stubborn illusion that helps make sense of the world.
Perhaps the strangest example of time dilation can be seen in and around black holes. Time ticks much differently the closer you get to the event horizon of a black hole. Imagine that you had two clocks — one held by an observer beyond the immensely strong gravity of the object and another held by an observer passing near the event horizon — the clock farther away would tick faster than the one close to the event horizon.
From the outside, the observer at the event horizon would begin to redshift, which means the wavelength of light they emit would move toward the red portion of the electromagnetic spectrum until the light becomes dimmer and dimmer. Inevitably, time would appear to stop altogether before the observer plunges into the event horizon. In theory, we would never actually see this occur, as the object would appear to freeze and never actually disappear into the black hole.
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