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**Hubble+/- 4.3%, is the constant "constant"?**

Why is the Hubble constant assumed to be "constant"? Just to keep things simple a la Occam's razor? Or is there a lot more to it than that?

With further increases in the accuracy of its measurement, and a few centuries to make repeated measurements, is anyone placing bets yet on its value turning out to NOT be a constant rate of acceleration?

I.e. the

*rate*of acceleration is either increasing or decreasing at a constant rate.

Or, the rate of acceleration is a function of some as yet undetermined factor that changes subtly over time.