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The mobile service tower is rolled back at Launch Pad 17-B, Cape Canaveral Air Force Station, to reveal NASA's Space Infrared Telescope Facility (SIRTF) ready for launch aboard a Delta II Heavy launch vehicle. Liftoff is scheduled for Aug. 25 at 1:35:39 a.m. EDT. SIRTF will obtain images and spectra by detecting the infrared energy, or heat, radiated by objects in space. Consisting of a 0.85-meter telescope and three cryogenically cooled science instruments, SIRTF will be the largest infrared telescope ever launched into space. It is the fourth and final element in NASAs family of orbiting Great Observatories. Its highly sensitive instruments will give a unique view of the Universe and peer into regions of space that are hidden from optical telescopes.