World Science Scholars
10.3 Time on Earth Clock Versus Time on Rocket Clock
demonstration

Check out this interactive demonstration, which compares the rates at which time elapses on an Earth clock versus a spaceship clock. Use the slider to set the rocket speed and press start. The slowing of time is hardly noticeable at speeds that are much less than $c$. But when the spaceship moves at speeds close to $c$, the slowing becomes dramatic. Take advantage of the pause function to compare the clock readings at different speeds.

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