Did NASA find anything on planets Jupiter (Galileo Spacecraft) or Saturn (Cassini–Huygens mission) that they didn't already?
see here on Planet Earth
Update:By Anything - I mean a chemical that we don't already have here on Planet Earth
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I don't think so, but I am pretty sure that they made a discovery about the 'giant red spot' on Jupiter. I could be wrong though.
Yes. See my source for a partial list of what they found.
Yes.