Maybe the speed of light isn’t constant?

From Stuart Clark at New Scientist:

The universe’s ultimate speed limit seems set in stone. But there’s good reason to believe it might once have been faster – and may still be changing now

Light’s constant, finite speed is a brake on our ambitions of interstellar colonisation. Our galaxy is 100,000 light years across, and it is more than four years’ light travelling time even to Proxima Centauri, the closest star to the sun and home, possibly, to a habitable planet rather like Earth. More.

Oddly, such a position was once widely derided as a young Earth creationist one.

It’s getting harder to be a respectable bigot these days. Just pounding the lectern in favor of a rock hard position and dumping insults on anyone who disagrees…

See also: Loophole in laws of physics enables light speed to increase?

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