The crew of Space Shuttle Discovery tested new equipment and procedures that increase the safety of space shuttles during the STS-121 mission to the International Space Station. It also performed maintenance on the space station and delivered supplies, equipment and a new Expedition 13 crew member to the station.
This mission carried on analysis of safety improvements that debuted on the Return to Flight mission, STS-114, and built upon those tests.
is back-ordered. We will ship it separately in 10 to 15 days.