In Interstellar when they were on the water planet, every minute they spent there, several days passed on Earth. From outside observer’s point of view from Earth, everything happening on the water planet was in slow motion. Why isn’t it the other way around?
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This effect of time going vaster away from mass already plays a role for satellites orbiting the Earth, whose clock has to be made to run slower in order to keep in sync with the clock on Earth. If I had to explain “why” this is so to a 5 year old, I would say that gravity just makes it harder to move, so everything, including the hands of a clock, is slowing down a bit near the Earth, a lot more near the Sun, and a vast amount more near a Black Hole.
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