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Photographers (left) and reporters (right) follow the snaking exhaust of the Boeing Delta II rocket carrying the Stardust spacecraft after its launch at 4:04:15 p.m. EST. A 24-hour scrub postponed the launch from the originally scheduled date of 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 grains and other …