Deep Impact showed Comet Tempel I to contain carbonate and clay remember:

Comet’s minerals hint at liquid water.
18:47 08 September 2005
NewScientist.com news service
"The comet crashed into by NASA's Deep Impact spacecraft on 4 July 2005 contains material apparently formed by liquid water and not ice, according to new observations with the Spitzer Space Telescope.
"This could suggests the disc of gas and dust from which the solar system formed got mixed together billions of years ago, whisking matter from warm regions near the Sun outward – or that an unknown process may allow a layer of liquid water to exist beneath the dusty coatings on comets.
"Spitzer was one of the 80 or so telescopes trained on Comet 9P/Tempel 1 when it rammed into the 370-kilogram copper-tipped impactor sent into its path. A spectrometer on the telescope detected a mix of materials as they streamed off the comet, including crystallised silicates, clay and carbonates."
http://www.newscientist.com/article.ns?id=dn7971&feedId=online-news_rss20

http://datacore.sciflicks.com/the_andromeda_strain/sounds/the_andromeda_strain_wild_fire_lab.wav

- Bob Clark