August 28, 2023
The current definition of the speed of light in a vacuum, 299,792.458 kilometers per second, was declared by a group of scientists in 1983. In 1728 English physician James Bradley used the apparent movement of stars to calculate the speed of light at 295,000 km/s—not bad for someone using just a telescope, pen, and paper.
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BRITANNICA.COM
Will Light-Speed Space Travel Ever Be Possible?
The idea of travelling at the speed of light is an attractive one for sci-fi writers. The speed of light is an incredible 299,792,458 meters per second. At that speed, you could circle Earth more than seven times in one second, and humans would finally be able to explore outside our solar system.
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