The open doors of Space Shuttle Discovery's payload bay show the cargo the orbiter will carry into orbit.

At Launch Pad 39B, the open doors of Space Shuttle Discovery's payload bay show the cargo the orbiter will carry into orbit. At the lower end is multi-purpose logistics module Leonardo. Above it is the integrated cargo carrier that holds the mobile transporter reel assembly the astronauts will replace on the station and a spare pump module. Discovery is scheduled to launch at 3:48 p.m. July 1 carrying a crew of seven on the 12-day mission to the International Space Station. Photo credit: NASA/Charisse Nahser