SUMMARY: Scientists are still digesting the volumes of data gathered by NASA's Stardust spacecraft when it buzzed past Comet Wild 2 earlier this year. They were expecting to see a dirty snowball, but found a much stranger place, with deep craters, steep cliffs, and dozens of blasting jets. Some features look ancient, perhaps created billions of years ago when life was just forming on Earth. Stardust collected particles from the comet when it flew past, and is now returning to Earth so scientists can study them in closer detail.

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