NASA's comet-crasher seeks clues to solar system origin

On a quest for the frozen remains of the solar system's formation, NASA is preparing to launch its Deep Impact probe that will smash a hole in a comet 82 million miles from Earth.

On a quest for the frozen remains of the solar system's formation, NASA is preparing to launch its Deep Impact probe that will smash a hole in a comet 82 million miles from Earth. NASA plans to stage the collision of Comet Tempel 1 and the Deep Impact probe on July 4, and in order to put the projectile in the right place for the encounter, Deep Impact must be launched by Jan. 28.

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