Light travels at amazing speed from "summary" of A Short History of Nearly Everything: Special Illustrated Edition by Bill Bryson
In the vastness of the universe, light is one of the most extraordinary phenomena. It possesses a speed that is truly remarkable. When we speak of the speed of light, what we are really talking about is 186,282 miles per second, or some 670 million miles an hour. To put this into perspective, if you could travel at the speed of light, you could circle the Earth seven and a half times in just one second. The speed of light is so fast that it can travel from the moon to the Earth in just a little over a second. This means that when we look up at the moon, what we are seeing is not the moon as it is now, but as it was just over a second ago. The light that bounces off the moon and enters our eyes has traveled an incredible distance in a minuscule amount of time. This speed of light has profound implications for our understanding of the universe. It means that light ...
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