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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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Just the Facts
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Even More Stuff...
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  Explore Comets in 3D Videos Activities

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Landing on a Comet - ESA's Rosetta Mission
Landing on a Comet - ESA's Rosetta Mission
ScienceCasts: How to Land on a Comet
ScienceCasts: How to Land on a Comet
The Rosetta Mission Asks: What Can We Learn from Comets?
The Rosetta Mission Asks: What Can We Learn from...
SOHO Sees Comet ISON Appear
SOHO Sees Comet ISON Appear
STEREO Watches Comet ISON, Nov. 20-25, 2013
STEREO Watches Comet ISON, Nov. 20-25, 2013
Comet ISON - Dazzle or Dust?
Comet ISON - Dazzle or Dust?
How to Cook a Comet
How to Cook a Comet
Great Comets from Humble Origins & Eyes on ISON: Hubble Public Lecture Series
Great Comets from Humble Origins & Eyes on ISON:...
Two Comets to Fly By Mercury on Nov 18 and 19
Two Comets to Fly By Mercury on Nov 18 and 19
Amateur Astonomers See Comet ISON Approaching the Sun
Amateur Astonomers See Comet ISON Approaching...
Comet ISON to Fly By Mars
Comet ISON to Fly By Mars
What is a Sungrazing Comet?
What is a Sungrazing Comet?
Hubble View of Comet ISON
Hubble View of Comet ISON
Dr. Jim Green Discusses NEOs
Dr. Jim Green Discusses NEOs
The Path of Comet ISON
The Path of Comet ISON
NASA's Deep Impact Spacecraft Images Comet ISON
NASA's Deep Impact Spacecraft Images Comet ISON
Previous
Previous
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Previous
Previous
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Next
Landing on a Comet - ESA's Rosetta Mission
Landing on a Comet - ESA's Rosetta Mission
ScienceCasts: How to Land on a Comet
ScienceCasts: How to Land on a Comet
The Rosetta Mission Asks: What Can We Learn from Comets?
The Rosetta Mission Asks: What Can We Learn from...
SOHO Sees Comet ISON Appear
SOHO Sees Comet ISON Appear
STEREO Watches Comet ISON, Nov. 20-25, 2013
STEREO Watches Comet ISON, Nov. 20-25, 2013
Comet ISON - Dazzle or Dust?
Comet ISON - Dazzle or Dust?
How to Cook a Comet
How to Cook a Comet
Great Comets from Humble Origins & Eyes on ISON: Hubble Public Lecture Series
Great Comets from Humble Origins & Eyes on ISON:...
Two Comets to Fly By Mercury on Nov 18 and 19
Two Comets to Fly By Mercury on Nov 18 and 19
Amateur Astonomers See Comet ISON Approaching the Sun
Amateur Astonomers See Comet ISON Approaching...
Comet ISON to Fly By Mars
Comet ISON to Fly By Mars
What is a Sungrazing Comet?
What is a Sungrazing Comet?
Hubble View of Comet ISON
Hubble View of Comet ISON
Dr. Jim Green Discusses NEOs
Dr. Jim Green Discusses NEOs
The Path of Comet ISON
The Path of Comet ISON
NASA's Deep Impact Spacecraft Images Comet ISON
NASA's Deep Impact Spacecraft Images Comet ISON
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