# Tag Info

### Since the Hubble Constant changes over time (it's a variable parameter), why can't the conflicting values of 67.4 and 73 both be right?

You are confusing the Hubble parameter $H(t)$, which is a function of time, with the Hubble constant $H_0=H(t=\text{today})$ which is the value of the Hubble parameter today, and so of course is a ...
• 3,740
The values you quote are for $H_0$, which is the value of the Hubble parameter at the present cosmic epoch. It is not some sort of average value over time. So, yes, the fact that different methods ...