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VANDENBERG AFB, Calif. – Technicians move NASA's IRIS spacecraft into a clean room at Vandenberg where the spacecraft will be readied for launch aboard an Orbital Sciences Pegasus XL rocket. IRIS is short for Interface Region Imaging Spectrograph and the spacecraft's mission will improve our understanding of how heat and energy move through the deepest levels of the sun’s atmosphere, thereby increasing our ability to forecast space weather. Photo credit: VAFB_Doug Gruber