Q:

What is the speed of light in miles per hour?

A:

Quick Answer

The speed of light in a vacuum is measured at 186,282 miles per second, which is 670,616,629 miles per hour. The speed of light is denoted mathematically by the symbol "c."

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What is the speed of light in miles per hour?
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Full Answer

Although early scientists thought that light traveled at an instantaneous speed, later experimentation concluded that there was a finite speed. Two French physicists in the mid-1800s, working simultaneously on different experiments, arrived independently at results that were within 1,000 miles per second of an accurate answer. It wasn't until 1879 when Prussian-born Albert Michelson, working in the United States, used a high-quality system of light beams, lenses and mirrors to arrive at the result of 186,355 miles per second, the most accurate measurement for the next 40 years.

Sources:

  1. space.com

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