Large and small planets are suspended at the edge of the solar system and are easily affected by the gravity of nearby stars  Researchers calculate that these forces sometimes pull comets out of the Oort Nebula  In this way, they are more likely to be close to the sun  Based on this, the two researchers made two different conclusions: first, Jupiter's gravity either pushed them into smaller orbits or expelled them from the solar system; second, Jupiter's gravity either pushed them into smaller orbits
or drive them out of the solar system
Jupiter's gravity did not push them into smaller orbits, but drove them out of the solar system.