Comets Are Giant Dirty Gritty Snowballs

 Why Study Comets?

http://deepimpact.jpl.nasa.gov/science/comets.html

Deep Impact Mission July 2005

http://deepimpact.jpl.nasa.gov/index.html  

http://stardust.jpl.nasa.gov/

http://spaceplace.jpl.nasa.gov/stardust/index.shtml

http://spaceplace.jpl.nasa.gov/cnsr_wordfind2.htm

http://spaceplace.jpl.nasa.gov/index.shtml

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