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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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Comet Giacobini-Zinner
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3-D models of comet 67P/Churyumov-Gerasimenko's nucleus
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NEOWISE Spies Comet C/2013 A1 Siding Spring
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Comet Siding Spring: Near Miss!
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Rosetta's Trajectory
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Rosetta at Comet
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How NASA Space Assets Observed Comet ISON
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ISON from the ISS
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Comet ISON Post Perihelion
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STEREO-A's Observations of Comet ISON
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Comet ISON From STEREO
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Smoothed SOFIA Images of Comet ISON
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X-Ray ISON
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Bright Comet ISON
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Comet ISON Enhanced
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Comet ISON Streaks Toward the Sun
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Previous
    1     2     3     4     5     6     7     8    
Next
Previous
    1     2     3     4     5     6     7     8    
Next
Comet Giacobini-Zinner
   Browse       View Full Size   
3-D models of comet 67P/Churyumov-Gerasimenko's nucleus
   Browse       View Full Size   
NEOWISE Spies Comet C/2013 A1 Siding Spring
   Browse       View Full Size   
Comet Siding Spring: Near Miss!
   Browse       View Full Size   
Rosetta's Trajectory
   Browse       View Full Size   
Rosetta at Comet
   Browse       View Full Size   
How NASA Space Assets Observed Comet ISON
   Browse       View Full Size   
ISON from the ISS
   Browse       View Full Size   
Comet ISON Post Perihelion
   Browse       View Full Size   
STEREO-A's Observations of Comet ISON
   Browse       View Full Size   
Comet ISON From STEREO
   Browse       View Full Size   
Smoothed SOFIA Images of Comet ISON
   Browse       View Full Size   
X-Ray ISON
   Browse       View Full Size   
Bright Comet ISON
   Browse       View Full Size   
Comet ISON Enhanced
   Browse       View Full Size   
Comet ISON Streaks Toward the Sun
   Browse       View Full Size   
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