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In the Payload Hazardous Servicing Facility, workers help guide the spacecraft Stardust being lowered in order to mate it with the third stage of a Boeing Delta II rocket. Targeted for launch Feb. 6 from Launch Pad 17-A, Cape Canaveral Air Station, aboard the Delta II rocket, the spacecraft is destined for a close encounter with the comet Wild 2 in January 2004. Using a silicon-based substance called aerogel, Stardust will capture comet particles flying off the nucleus of the comet. The spacecraft also will bring back samples of interstellar dust. These materials consist of ancient pre-solar interstellar grains and other remnants left over from the formation of the solar system. Scientists expect their analysis to provide important insights into the evolution of the sun and planets and possibly into the origin of life itself. The collected samples will return to Earth in a sample return capsule to be jettisoned as Stardust swings by Earth in January 2006