In the movie Interstellar, time moves differently on different planets because of a concept called gravity. Gravity is a force that pulls things towards each other, and it affects how time passes. The stronger the gravity, the slower time moves. This is based on a real idea from physics called relativity, which explains how gravity and movement can change how we experience time.
On Earth, we have a certain amount of gravity that makes time pass at a normal speed for us. However, if you were to travel to a planet with much stronger gravity, like a planet near a black hole, time would move much slower compared to Earth. This means that if you spent a few years on that planet, many years could have passed on Earth because time was moving faster there.
In Interstellar, the characters visit a planet near a massive black hole, which has incredibly strong gravity. As a result, time passes very slowly on that planet compared to Earth. This creates a big difference in how much time passes for the characters on the planet versus their friends and family back on Earth.
The movie uses this idea to explore how time can be different in different places, depending on how strong the gravity is. It’s a fascinating concept that helps us think about how time isn’t always the same everywhere in the universe.