CAPE CANAVERAL, Fla. --- On Pad 17-B at Cape Canaveral Air Force Station in Florida, United Launch Alliance technicians check the list of activities completed on the mating of the nine solid rocket boosters to the Delta II rocket for the launch of NASA's Gamma-ray Large Area Space Telescope, or GLAST. The 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. Launch is currently planned in a window between 11:45 a.m. and 1:40 p.m. May 16. Photo credit: NASA/Troy Cryder