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Comet
 

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      a ball of frozen gases, rock and dust that is about the size of a small town.
      Comets orbit the sun. Jets of gas and dust from comets form long tails
      that can be seen from Earth.
 


Sentences:
NASA sent the Deep Impact spacecraft to crash into a comet and study what it is made of.

Comets are sometimes called "dirty snowballs" because of what they are made of.

 


Related Links:
What Is Inside a Comet?
Comets at Starchild

 

 

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A true-color image of Comet NEAT
A comet's tail always points away from the sun.
Image Credit: 
NASA
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Page Last Updated: October 9th, 2014
Page Editor: Sandra May