The concept of variable speed of light (VSL) refers to hypotheses suggesting that the speed of light is not a constant value, but can vary under different conditions or in different epochs of the universe. In standard physics, particularly in Einstein's theory of relativity, the speed of light in a vacuum is considered a fundamental constant, approximately 299,792 kilometers per second (about 186,282 miles per second). This constancy is central to many physical theories and calculations.
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