I’ve read this a few times. The Oort cloud (is it even proven to exist, BTW?) is home of the “baby” comets… and its really far out from the sun. Comets start getting pulled towards the sun when a “passing by star” disturbs them. Sounds plausible enough for my feeble mind.
Question I have though is this. Where are these stars that “passed-by” the Oort cloud? We should be able to see them still, even if it has been millions (or even tens/hundreds of millions) of years, correct? Don’t we have a good idea of how close and fast moving our “neighbor” stars are? Do we know which ones came close enough to disturb the cloud? Could we calculate back as to when a star came close enough to disturb them and figure out “roughly” how long it will take for the comets to come into the “inner” solar system? Or is that getting pretty far fetched?