If space and time are one and the same thing, then why is space expanding while time isn't?
The FLRW metric can be written in conformally flat coordinates such that the scale factor applies to the time coordinate too.
who says it isn't?
>>16283530Pretty sure time is expanding, if it weren't expanding how would it move
>>16283530They’re not the same intrinsically but that is one way to model it that gives pretty good predictive power.