A truck carrying the third stage of the Orbital Sciences Pegasus XL rocket that will carry NASA's Interface Region Imaging Spectrograph (IRIS) spacecraft arrives at Vandenberg Air Force Base in California.
A truck carrying the third stage of the Orbital Sciences Pegasus XL rocket that will carry NASA’s Interface Region Imaging Spectrograph (IRIS) spacecraft arrives at Vandenberg Air Force Base in California. Image credit: NASA/Randy Beaudoin, VAFB May 11, 2012