NASA's Dawn mission is getting ready to launch on an unprecedented tour of two residents of the asteroid belt. This mission will be the first to orbit two different bodies in our solar system.
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The first Delta flew in 1960, and the rocket family has been growing ever since.
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Take look at some of the steps that go into processing the Dawn spacecraft and its Delta II rocket for launch.
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Dawn's mission manager discusses the preparation of a Delta II rocket for the flight.
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