The mobile service tower with solid rocket boosters inside nears the Delta II first stage.

On Launch Pad 17-B at Cape Canaveral Air Force Station, the mobile service tower with solid rocket boosters inside nears the Delta II first stage. The Delta is the launch vehicle of the Dawn spacecraft. Dawn's goal is to characterize the conditions and processes of the solar system's earliest epoch 4.5 billion years ago by investigating in detail two of the largest asteroids, Ceres and Vesta. They reside between Mars and Jupiter in the asteroid belt. Launch is targeted for July 7. Photo credit: NASA/Jim Grossmann