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VANDENBERG AIR FORCE BASE, Calif. – Videographer Lori Losey, back seat, and pilot Jim Less board an F-18 aircraft at Vandenberg Air Force Base in California. The F-18 will be the "chase plane" for the Orbital Sciences L-1011 aircraft transporting the Pegasus XL rocket that will launch NASA's Interface Region Imaging Spectrograph, or IRIS, solar observatory to orbit. Release of the rocket from under the wing of the L-1011 is scheduled for 10:27 p.m. EDT. IRIS will open a new window of discovery using spectrometry and imaging to trace the flow of energy and plasma through the chromospheres an…