Video narration
Does everyone measure time and motion in exactly the same way? Picture a bus moving past you. You say the bus is moving; a student inside can say you and the road are moving backward. Both work: motion depends on the observer. But here is the turn: the speed of light in empty space stays the same for everyone-even when they move differently. Near light speed, measurements adjust. Time passes differently, and distances change, while the laws of physics stay consistent. These effects are tiny on a bus, but important near light speed. Special relativity explains this motion effect. General relativity adds gravity: mass and energy curve spacetime, the combined picture of space and time. Strong gravity can also change how quickly time passes. So, does everyone measure time identically? No. Motion and gravity change the measurements-but neither observer is wrong. Each follows the same physical rules.