I understand that, for any scientific theory, the "refuted" theory can always be saved by adjusting it to fit the contrary evidence. There is no logical point at which scientists must give up their theory, but theories are often nevertheless abandoned by their adherents (possible when all the old scientists who believed the theory die off).
The old astronomy was not, in any exact sense, 'refuted" by the telescope. The scarred surface of the Moon and the satellites of Jupiter can, if one wants, be fitted into a geocentric scheme... How far, by endless tinkerings, it could have kept up with them till even now, I do not know. But the human mind will not long endure such ever-increasing complications if once it has seen that some simpler conception can 'save the appearances." The new astronomy triumphed, not because the case for the old became desperate, but because the new was a better tool, and once this was grasped, our ingrained conviction that Nature herself is thrifty did the rest.
C. S. Lewis, The Discarded Image, 219-220.