KSC-2010-3840 CAPE CANAVERAL, Fla. -- In the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, external fuel tank ET-137 for space shuttle Discovery's STS-133 mission is lowered into position to be attached to the twin solid rocket boosters. Discovery will deliver NASA's Permanent Multi-purpose Module, or PMM, the Express Logistics Carrier 4, and critical spare parts to the International Space Station. Launch is targeted for fall 2010. Photo credit: NASA_Jack Pfaller
