The thing that blows my mind is not that one measurement is higher and another lower, it's just how closely they agree: to less than 10%. This despite the fact that they were arrived at from different instruments and lines of inquiry. The earlier measurement from Planck satellite measurements is derived from measurements of cosmic background radiation. The newer measurement comes from images of gravitational lensing of distant quasars, from the Hubble and Spitzer telescopes. For such a tricky measurements, and such an abstruse topic, I wouldn't have been surprised if they differed by an order of magnitude.* And yet, the agree pretty closely.
Science is really freaking awesome. Sure, assuming that the expansion is universal and constant (i.e., there is only one value for the Hubble Constant, which is hardly a sure thing), you ought to be able to measure the same answer by any
experiment designed to measure it, within the experimental error. I ought
to arrive at the same value for the gravitational constant, too, whether I experiment using a precision pendulum, or dropping a cannonball from the tower of Pisa (accounting for air friction, of course), or analyze the tides, or by successfully putting a man on the Moon. It doesn't matter who I am, or where I live, or under which government, or what language(s) I speak - it all still works.
* Hubble's own initial estimate was
about 10x the current values. For those that are interested, here's a graph of the value of H0
, with error bars, through history. [source