Suppose you were hubble and humason, working on the distances and doppler shifts of the galaxies. what sorts of things would you have to do to convince yourself (and others) that the relationship you were seeing between the two quantities was a real feature of the behavior of the universe? (for example, would data from two galaxies be enough to demonstrate hubble’s law? would data from just the nearest galaxies—in what astronomers call “the local group”—suffice? )