Ok, this is really ELI5 so using basic ideas.
Time is the measurement of things happening. You describe stuff happening by describing the time it takes.
Gravity, as you know, makes everything “heavier.” Heavier things do stuff more slowly – it takes more effort to do things when you’re heavy so it takes you longer. Think of movie scenes where someone is speeding in a car or rocket so fast they struggle to lift their arm. Acceleration is the same as gravity.
TL;DR: the more gravity there is, the slower things move because it takes so much more energy.
A little more explanation… gravity affects EVERYTHING, including space and time. So while you yourself may feel heavier in more gravity, the underlying, invisible fabric of reality also itself feels heavier, which affects, well, reality.
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