On Wed, Feb 19, 2014 at 1:29 PM, Axil Axil <janap...@gmail.com> wrote:
One of the assumptions of relativity is that the speed of light is > constant in a vacuum, but it may not always be so. > The discussion elsewhere has been about the speed of light measured with respect to a given inertial frame. It is a related but different question to ask whether the speed of light has always been what it currently is. Eric
