Travel destinations for Gravitational Effects When a comet comes close to a planet either on the way toward or away from the inner solar system, it is gravitationally perturbed. This can have a signiicant effect on its orbit. Jupiter has the greatest gravitational pull in the solar system and so is the chief bully of the comet population. For example, it was an encounter with Jupiter in April that changed the period of Hale-Bopp from , years to , years. Saturn is likewise capable of seriously perturbing comets that venture too close. Other planets such as Uranus and Neptune may also act to change the speed and trajectory of a comet. Jupiter may also throw comets out of the solar system altogether, or cause comets to split or disintegrate. Travel destinations 2016.