Stardust probe sifts through the remains of a collision between comet and machine

In 2005, NASA's Deep Impact probe shot an 800-pound subsidiary probe into the comet Tempel 1. Now, six years later, the new Stardust probe has returned to the comet to see our handiwork. But this isn't just about proving humanity can leave its mark anywhere in the cosmos - the artificially created crater kicked up… »2/16/11 5:00pm2/16/11 5:00pm