Light's speed is constant from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
In the realm of physics, one of the most fundamental principles is that the speed of light is constant. This means that light always travels at the same speed, regardless of the motion of the light source or the observer. This concept was first proposed by Albert Einstein in his theory of relativity, which revolutionized our understanding of the universe. The idea that light always moves at a constant speed may seem counterintuitive at first. After all, we are used to thinking of speed as a relative concept - something that can change depending on the frame of reference. However, Einstein's theory of relativity showed that this is not the case when it comes to light. No matter how fast an observer is moving relative to a light source, they will always measure the speed of light as being the same. This conc...
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