Viewing a single comment thread. View all comments

The_Dark_Passenger93 OP t1_iyxgy0k wrote

Reply to comment by UtetopiaSS in How are we sure that speed of light and other basic constants are really constants on a large cosmological scale of time and space? by The_Dark_Passenger93

I know about speed of light in other mediums, but the speed of light in vacuum is C and always constant, isn't it? Thanks for the insight on the speed of light, but what about other constants? How we assure that they are immutable?

4

Traditional_Story834 t1_iz0xl4y wrote

It's constant to the observer, perceived changes in the speed/energy of the light they are observing are actually changes in time itself. Measuring the actual speed of light is impossible.

Theoretically.

2