- #1
phoenixthoth
- 1,605
- 2
how is it known that the speed of light (or any physical constant) is constant?
couldn't it be that it's changing at a slow rate? over a 15 billion year history, this adds up to a significant change in the speed of light.
if c* was the speed of light when t=0 and if it gets multiplied by a factor of 1.0000000001 every millenium, since there have been 15 million millenia (though that would be drawn into question if c is not constant), that would add up to 1.0000000001^(15 10^9)=4.5 times as fast now than it was when t=0.
couldn't it be that it's changing at a slow rate? over a 15 billion year history, this adds up to a significant change in the speed of light.
if c* was the speed of light when t=0 and if it gets multiplied by a factor of 1.0000000001 every millenium, since there have been 15 million millenia (though that would be drawn into question if c is not constant), that would add up to 1.0000000001^(15 10^9)=4.5 times as fast now than it was when t=0.