The STS-121 crew also includes pilot Mark Kelly, mission specialistsMichael Fossum, Stephanie Wilson and Piers Sellers, and European astronaut ThomasReiter.

Joining STS-121 commander Steven Lindsey are mission specialist Michael Fossum, pilot Mark Kelly, and mission specialists Lisa Nowak (partly visible at left), Stephanie Wilson, Piers Sellers and ...

The autonomous repair access demonstrated on STS-121 is a "significant step forward" in the decision process for a final Hubble Space Telescope servicing mission, says John Shannon, shuttle deputy ...

The STS-121 launch of Space Shuttle Discovery on July 1 will mark the first use of Firing Room 4 (FR 4) for a space shuttle launch countdown.

NASA STS-121 Launch Date AnnouncementNASA officials will host a news conference no earlier than 2 p.m. EDT, Saturday, June 17, following a two-day detailed assessment of the readiness of Space ...

Should Discovery’s STS-121 spacewalkers be forced to make a serious heat shield repair, the chances of which NASA officials believe to be extremely remote, flight controllers could opt to try to ...

Launching from pad 39B at Kennedy Space Center (KSC) STS-121 is the eighteenth US mission to the ISS and the 32nd flight for Discovery.

More than 4,300 pounds of cargo will be packed for the return to Earth. The next STS-121 mission status report will be issued Monday evening, or earlier if events warrant.

Testing of gap fillers with STS- 121 type defects showed that extremely low loads (.03 lbs) are required to bend over the gap filler.