| Formation of Oort cloud comets |
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| � | Composition
indicates formation in region |
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| between
Jupiter and Neptune |
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| � | Ejected
to the Oort cloud by near |
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| collisions
as Jovian planets formed |
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| � | Most
probably lost from solar system � a |
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| few
have just barely closed orbits |
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| � | Occasional
passing stars perturb more |
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| comets
into orbits passing in close to sun |
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