Lets assume the scale of the Milky Way to be 1000 millimetres and the distance of the light travelled for 100 years to be II 1mm, so lets fire up the propulsion and see if it possible,
that is to say that until you get the results from its destination point it will remain a theory.
Anyone could observe the electromagnetic field 300 or 1000 years ago but no one could explain it, everyone and every thing such as photons are effected by Newton’s gravity and Einstein’s relativity,
but that’s not the whole story about the gravity and the rest, is it,.?
Higgs field used to be a theory and now (aprox 99.97%) fact, currently that’s more fact than a probe in another solar system.
The major question I think would be to know whether it’s possible to cover enough space within human existence or if it’s possible to go far beyond.
Since there isn’t a definitive/proven answer, no one is certain 100% to even answer about non-locality, dark energy or expansion faster than light.
These are lectures, can be interesting or boring.
Non-locality with regards to some information:
The mystery of empty space some time before the Higgs being approved but still on topic: