Light Speed a constant? - maybe not!

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The speed of light in a vacuum, or c, is pretty much the most fundamental constant in physics – and according to the general theory of relativity, gravity travels at the same rate.

But a new study suggests that the speed of light might not have always been this speed. In fact, in the early Universe, light might have outpaced gravity, and this new hypothesis could solve one of the biggest problems in physics.

Complete story at Science Alert.