Measuring up: how our search for the speed of light led to our current understanding of physics
Physics World
JUNE 26, 2021
It is arguably the most important constant in physics, it is easily visualized by anyone and its symbol is widely known among the public: c , the speed of light in vacuum. If your neighbour knows an equation, it’s probably Albert Einstein ’s E = mc 2 , and even schoolchildren learn that light takes about eight minutes to travel from the Sun to the Earth.
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