I don't follow this stuff as much as I like, but I am going to link to JPL's home page for the Deep Impact comet exploration mission. Deep Impact consists of two parts, a flyby spacecraft and a spacecraft that detaches from the flyby craft called the impactor, which does what one would expect from something called an "impactor". The scientist hope that by letting comet Tempel 1 run over the impactor at over 5 miles/sec they (and we) can learn what comets are made of. Could be they're made of stardust...
Anyway, here's the NASA mission page, too.
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