Speed of Light
A constant of Nature. This speed is precisely 299,792,458 meters per second, or roughly 670,616,629 miles per hour. One of the most unusual discoveries of science has been the fact that all Observers measure light as moving at exactly this speed, even if those observers are moving relative to each other. This fact is one of the basic ingredients in Einstein's Special Theory of Relativity.
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Inspiration
In the 1st year of the period Chih-ho, the 5th moon, the day chi-ch'ou, a guest star appeared...