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Apr 12, 2017 · Today the speed of light, or c as it's commonly known, is considered the cornerstone of special relativity – unlike space and time, the speed of light is constant, independent of the observer. What's more, this constant underpins much of what we understand about the Universe.
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The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).
Unless it's travelling through a vacuum, the speed of light isn't always constant. It depends on the medium the light is travelling through.
Jul 16, 2020 · We all know and love the speed of light, but why does it have the value that it does? Why isn't it some other number? And why did it become such a cornerstone of physics?
The speed of light is a universal constant and does not depend on the speed of light relative to an observer. It is always measured at 300,000 km/sec by any observer. Einstein's crucial breakthrough, in 1905, can be summed up in a deceptively simple statement: The speed of light is constant.
Jan 23, 2024 · The speed of light is 299,792,458 meters per second and that constant tells us much about cause and effect in the universe.
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The constant speed of light was to become one of the two main planks of his Special Theory of Relativity, which we will examine in more detail in the next section. The other main plank was the "principle of relativity" (or "principle of invariance"), an idea first stated by the great Italian physicist Galileo Galilei as early as 1632.
