Time does not move at the same speed everywhere in the universe. In this video, we explain time dilation simply — how gravity and speed slow down time, why astronauts age differently, and what happens to time near black holes — using real NASA visualizations. Time dilation isn’t science fiction. It’s a real, measured effect predicted by Einstein and used every day in GPS technology. By the end of this video, you’ll understand why time bends, stretches, and behaves differently across the universe. ⭐ CHAPTERS 00:00 – Why Time Isn’t Constant 00:20 – What Time Dilation Means 01:00 – Gravity Slows Down Time 01:50 – Time Near a Black Hole 02:45 – Speed and Time Dilation 03:30 – The Twins Paradox 04:05 – Final Thoughts