The Article talks about interstellar space, aside from some occasional planemos, there are no substantial gravity wells outside of solar systems. It would proba

The Article talks about interstellar space, aside from some occasional planemos, there are no substantial gravity wells outside of solar systems. It would probably move along according to the local standard of rest (~flow of material) in the galaxy. And this material would also probably not get trapped inside solar systems to a large degree, because as the article notes, the solar wind has a greater infuence on it than gravity.