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At Launch Pad 17-A, Cape Canaveral Air Station, the Stardust spacecraft, attached to the third stage of a Boeing Delta II rocket, is lifted up the launch tower. The second and third stages of the rocket will be mated next as preparations continue for liftoff on Feb. 6. Stardust 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 g…