NASA's Solar Terrestrial Relations Observatory STEREO spacecraft arrives at Astrotech to begin preparations and final testing for launch.

NASA's Solar Terrestrial Relations Observatory (STEREO) spacecraft arrives at Astrotech, a payload processing facility near Kennedy Space Center in Florida, to begin preparations and final testing for launch. Liftoff will occur aboard a Boeing Delta II rocket from Launch Complex 17 on Cape Canaveral Air Force Station in the summer. 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