The first stage of the Boeing Delta II rocket is in position in the mobile service tower for stacking with the rocket's other stages.

The first stage of the Boeing Delta II rocket, slated to launch NASA's Solar Terrestrial Relations Observatory (STEREO), is in position in the mobile service tower at Pad 17B on Cape Canaveral Air Force Station for stacking with the rocket's other stages. Preparations are under way for a liftoff no earlier than July 22. STEREO consists of two spacecraft whose mission is the first to take measurements of the sun and solar wind in 3-D. This new view will improve our understanding of space weather and its impact on the Earth. Photo credit: NASA/Jim Grossmann