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KENNEDY SPACE CENTER, FLA. - One of NASA's Solar Terrestrial Relations Observatory (STEREO) spacecraft is exposed to the clean room environment at Astrotech, a payload processing facility near Kennedy Space Center in Florida, as workers continue to remove its protective covering. The spacecraft arrived on May 3 and will now undergo final preparations and 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