There is a theory that says the speed of light can be variable and as published in Science Daily, where TIL about this theory, it could be tested soon.
According to Einstein the speed of light was constant in any situation.
But the Dr. Niayesh Afshordi of the Perimeter Institute in Canada, together with other colleges, has made some predictions that could be used to test the validity of the variable-speed theory of light.
"The idea that the speed of light could be variable was radical when first proposed, but with a numerical prediction, it becomes something physicists can actually test. If true, it would mean that the laws of nature were not always the same as they are today." - Science Daily
To know more details about this interesting theme, here I leave the link where TIL that there is this theory that challenges Einstein's physics and could be tested soon.
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