most comets are regular visitors, some with orbits of only a few years, others taking decades,...

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Page 1: Most comets are regular visitors, some with orbits of only a few years, others taking decades, centuries, or even millennia to return. A few never return, being instead gravitationally
Page 2: Most comets are regular visitors, some with orbits of only a few years, others taking decades, centuries, or even millennia to return. A few never return, being instead gravitationally
Page 3: Most comets are regular visitors, some with orbits of only a few years, others taking decades, centuries, or even millennia to return. A few never return, being instead gravitationally
Page 4: Most comets are regular visitors, some with orbits of only a few years, others taking decades, centuries, or even millennia to return. A few never return, being instead gravitationally