NASA has had a mission going for slightly over three years now to collect samples from a comet and return them to earth.

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

Project Stardust has successfully rondezvoused with comet Wild-2, and collected its samples.

http://stardust.jpl.nasa.gov/news/status/040102.html

Now, if the return trip goes as smoothly, then we'll be set.

Just hope the Mars landing goes as well tomorrow as this mission has gone.

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