It is explained in the article: > The effect of a passing star on the Oort Cloud is a function of the star's mass, speed and proximity. The worst case scen

It is explained in the article: > The effect of a passing star on the Oort Cloud is a function of the star's mass, speed and proximity. The worst case scenario for stirring up comets would be a slow-moving, massive star that came close to the Sun. > Scholz's star came relatively close, but the binary system (the red dwarf and its brown dwarf companion) has a low mass and it was speeding by. These factors conspired to make its effect on the Oort Cloud very small.