One of the hot topics in modern cosmology is the so-called "Hubble
tension". There is no consensus as to which, if any, solution is
correct. Many of the solutions are ad hoc, in the sense that it
was the Hubble tension itself which led to their proposal; that is not
necessary an indication that they must be wrong, and sometimes there is
some additional justification. I'm happy to be corrected, but as far as
I know there was no theory which predicted the current Hubble
tension of about 6 km/s/Mpc (with statistical uncertainties claimed to
be much smaller); while technically postdictions are just as good,
predictions are more impressive. Whether the solution turns out to
involve interesting new physics or some banal explanation, perhaps the
most interesting result will be that a consensus on the cause of the
Hubble tension will rule out all of the other proposed
explanations with one fell swoop.
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