system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why gravity slows down the time instead of speeding it up?

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?
gpt
Stretch a sheet of rubber and put a giant, heavy object in the middle to stretch the rubber down. Measure the length of the rubber in the middle and the length on the edge. The path through the middle is longer. Now imagine a marble or some other object traveling across the rubber at a specific speed that cannot change. The marble going through the stretched region will take longer to reach the opposite side of the sheet than a marble traveling on the unstretched region.

Space-time is the rubber, and causality is the marble.