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In this video I will explain Einstein's brilliant concept that any observer sees light moving at the speed of light regardless of the speed of the observer or the speed of the source. An observer moving at v=0.9c towards a light source will see that light moving at the speed of light. Similarly, an observer (stationary, v=0) on Earth will see light moving at the speed of light from a space ship traveling towards Earth at v=0.8c.

Next video in this series can be seen at:
https://youtu.be/S1tlJSn72Is