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Jupiter stirs up the asteroid belt through dynamical effects called "mean motion resonances." A mean motion resonance happens when the orbit of an asteroid has the right period so the asteroid closely encounters a planet at the same location in the solar system over and over again. When this happens between the asteroid and Jupiter, Jupiter's gravitational tugs on the asteroid add up and reinforce each other, and they can easily boot the asteroid out of the solar system. Astronomers believe that one reason Earth is habitable is that the gravity of Jupiter does help protect us from some comets. Long - period comets, in particular, enter the solar system from its outer reaches. Jupiter's gravity is thought to sling most of these fast - moving ice balls out of the solar system before they can get close to Earth. So long - period comets are thought to strike Earth only on very long timescales of millions or tens of millions of years. Without Jupiter nearby, long - period comets would collide with our planet much more frequently. Follow
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