I'd say that the negation of GR's prediction of expansion is that a homogeneous and isotropic universe that doesn't expand at any point in its history is a possibility. Disregarding that detail (we could nitpick the details for a long time), I would say that Newtonian physics very clearly does say all those things.It's only right when
- Newton's theory explicitly predicts:
NO time dilation AND NO length contraction AND NO gravitational time dilation AND NO orbital decay of binary pulsars AND NO black holes AND that a homogeneous and isotropic universe must NOT be expanding
There's experimental/observational support for all of those.- AND these predictions are correct:
time dilation AND length contraction AND gravitational time dilation AND orbital decay of binary pulsars AND black holes AND that given homogeneous and isotropic universe it is expanding.
It's very hard to doubt that the universe is expanding, given what's been observed. I think there's also strong observational evidence for black holes, but I'm not familiar with the details.Or maybe GR has no saying in these things? Say it is stretched too far using some highly speculative assumptions.