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VANDENBERG AIR FORCE BASE, Calif. – An F-18 aircraft flies by a launch pad as it departs from Vandenberg Air Force Base in California. The plane will serve as the "chase plane" accompanying the Orbital Sciences L-1011 aircraft as it transports the Pegasus XL rocket carrying NASA's Interface Region Imaging Spectrograph, or IRIS, solar observatory over the Pacific Ocean. 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…
