The speed of light is the foundation of many important theories, such as special relativity. At the first glance, scientists thought the speed of light might be measured to distinct values when viewed from different perspectives. However, the Michelson-Morley experiment told us the speed of light doesn't show any difference in any direction. One the other hand, Shapiro time delay confirmed massive objects can slow down light passing by. Is the speed of light constant? What is the true meaning of constant speed of light? All in 8 minutes.
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