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water on saturn's moon

Subject: water on saturn's moon
Date: Sat, 11 Mar 2006 02:05:14 -0800
Newsgroups: sci.astro
I know this is probably a very dumb question for all you leaned people,
but how do they know it is water coming from those geysers, and not
something else like liquid nitrogen or something else? do they use some
kind of spectrometer instrument from the probe to figure it out? how do
they KNOW it is water?  mike 

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