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CAPE CANAVERAL, Fla. -- Inside the mobile service tower on Launch Pad 17-B at Cape Canaveral Air Force Station, workers secure the top of the payload fairing into place around NASA's Gamma-Ray Large Area Space Telescope, or GLAST. The fairing is a molded structure that fits flush with the outside surface of the Delta II upper stage booster and forms an aerodynamically smooth nose cone, protecting the spacecraft during launch and ascent. GLAST is a powerful space observatory that will explore the Universe's ultimate frontier, where nature harnesses forces and energies far beyond anything possible on Earth; probe some of science's deepest questions, such as what our Universe is made of, and search for new laws of physics; explain how black holes accelerate jets of material to nearly light speed; and help crack the mystery of stupendously powerful explosions known as gamma-ray bursts. The launch date is targeted no earlier than June 3. Photo credit: NASA/Jim Grossmann