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At Pad 17A, Cape Canaveral Air Station, a fourth and final solid rocket booster (SRB) (right) is moved from the mobile tower by a crane before mating with the Delta II rocket (left). The rocket will be aided by four SRBs to carry the Stardust satellite into space for a close encounter with the comet Wild 2 in January 2004. Using a medium called aerogel, Stardust will capture comet particles flying off the nucleus of the comet, plus collect interstellar dust for later analysis. The collected samples will return to Earth in a Sample Return Capsule to be jettisoned as Stardust swings by Earth in January 2006. Stardust is scheduled to be launched on Feb. 6, 1999