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KENNEDY SPACE CENTER, FLA. -- The mobile service towers on Launch Pads 17-A (left) and 17-B (right) are silhouetted against the pre-dawn sky at Cape Canaveral Air Force Station. In the background are the launch gantries. Pad 17-B is the site for the launch of the Dawn spacecraft on June 30. Dawn's mission is to explore two of the asteroid belt's most intriguing and dissimilar occupants: asteroid Vesta and the dwarf planet Ceres. Photo credit: NASA/Amanda Diller