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We are told that the speed of light is finite. Why? What is it that prevents light speed being variable? Isn't there some evidence to suggest that it has varied over the eons?

Question asked by: meatloaf

The speed of light is both finite and defined.

This is one of the cornerstones of modern physics - that light travels at a set speed, and this is used in all sorts of equations.

No variation from the speed of light has ever been found for light, so it always travels at that speed.

Nothing can travel faster than light either.

By: knowitall
Replied at: 31 Mar 2008
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Comments and other answers:

The speed of light can differ, basically because of the effect of gravity, according to general relativity
By: Chris19579

Date of comment: Tue, May 5th 2009

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light  speed  evidence  suggest  eons  varied  isn't  

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