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# Einstein’s thought experiment that transformed physics
- URL: https://www.cascadepbs.org/show/nova/extras/einsteins-thought-experiment-that-transformed-physics-r74q1e/
- Published: 2025-07-25T09:00:54.000Z
- Updated: 2025-07-30T03:00:18.000Z
- Description: The faster you move, the stranger time becomes.
- Author: Cascade PBS Staff
- Tags: NOVA, #ZZZ_Show_8f1ff589-6222-4260-acbf-0523a6424abf, #v1.6, #ZZZ_Extra_6c84349a-5d71-4e4e-9656-dbb2d59f8df7, #extra

By imagining how light travels to two people moving at different speeds, Einstein showed that time isn’t absolute. His thought experiment revealed that what seems like “now” depends on where you are and how fast you’re moving.