Processing Facility a United Space Alliance worker monitors a main engine as it is lowered onto a transporter.

In the Space Shuttle Main Engine Processing Facility at NASA's Kennedy Space Center in Florida, a United Space Alliance worker monitors a main engine as it is lowered onto a transporter. The engine is being moved to Orbiter Processing Facility Bay 3 where it will be installed in space shuttle Discovery during processing for the shuttle's STS-131 mission to the International Space Station.

The seven-member STS-131 crew will deliver a Multi-Purpose Logistics Module filled with resupply stowage platforms and racks to be transferred to locations around the station. Three spacewalks will include work to attach a spare ammonia tank assembly to the station's exterior and return a European experiment from outside the station's Columbus module. Discovery's launch, targeted for March 18, 2010, will initiate the 33rd shuttle mission to the station. For information on the STS-131 mission and crew, visit http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts131/index.html. Photo credit: NASA/Jim Grossmann