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Icy Travelers
Comets are cosmic snowballs of frozen gases, rock and dust roughly the size of a small town. When a comet's orbit brings it close to the sun, it heats up and spews dust and gases into a giant glowing head larger than most planets. The dust and gases form a tail that stretches away from the sun for millions of kilometers.

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Wild 2 Flyby
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Comet Wild 2's Heart
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Giotto at Halley
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Approaching Wild 2
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Scorched Comet
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Comet C/2002 V1 (NEAT)
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Comet Borrelly Composite
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Borrelly's Rugged Surface
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Shoemaker-Levy 9: Fragment W Impact (4 images)
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Shoemaker-Levy 9: Fragment W (12 Images)
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Shoemaker-Levy 9: Fragment N
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Shoemaker-Levy 9: Fragment K
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Previous
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Wild 2 Flyby
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Comet Wild 2's Heart
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Giotto at Halley
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Approaching Wild 2
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Scorched Comet
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Comet C/2002 V1 (NEAT)
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Comet Borrelly Composite
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Borrelly's Rugged Surface
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Shoemaker-Levy 9: Fragment W Impact (4 images)
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Shoemaker-Levy 9: Fragment W (12 Images)
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Shoemaker-Levy 9: Fragment N
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Shoemaker-Levy 9: Fragment K
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