> There is no chance that one day c or even g could change (no matter what "scientists" used to say in journals).
Well the thing is, c is defined in metres per second. And since 1983, the metre "has been defined as 'the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second.'".[0]
Well the thing is, c is defined in metres per second. And since 1983, the metre "has been defined as 'the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second.'".[0]
Since 1983, c is defined as constant.
[0] https://en.wikipedia.org/wiki/Metre