KENNEDY SPACE CENTER, FLA. -- The STS-118 crew arrives at Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 8 aboard Space Shuttle Endeavour. Seen here is Mission Specialist Barbara Morgan, NASA's first educator astronaut. Endeavour's STS-118 mission is the 22nd shuttle flight to the International Space Station. It will continue space station construction by delivering a third starboard truss segment, S5. Other payloads include the SPACEHAB module, making its last voyage, and the external stowage platform 3 with a control moment gyroscope on it. The flight will include at least three spacewalks. The crew will also debut a new system that enables docked shuttles to draw electrical power from the station to extend visits to the outpost. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew arrives at Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 8 aboard Space Shuttle Endeavour. From left are Commander Scott Kelly, Pilot Charlie Hobaugh, and Mission Specialists Tracy Caldwell, Rick Mastracchio, Dave Williams (with the Canadian Space Agency), Barbara Morgan and Alvin Drew. Endeavour's STS-118 mission is the 22nd shuttle flight to the International Space Station. It will continue space station construction by delivering a third starboard truss segment, S5. Other payloads include the SPACEHAB module, making its last voyage, and the external stowage platform 3 with a control moment gyroscope on it. The flight will include at least three spacewalks. The crew will also debut a new system that enables docked shuttles to draw electrical power from the station to extend visits to the outpost. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew arrives at Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 8 aboard Space Shuttle Endeavour. Seen here is Mission Specialist Alvin Drew as he talks to the media. Endeavour's STS-118 mission is the 22nd shuttle flight to the International Space Station. It will continue space station construction by delivering a third starboard truss segment, S5. Other payloads include the SPACEHAB module, making its last voyage, and the external stowage platform 3 with a control moment gyroscope on it. The flight will include at least three spacewalks. The crew will also debut a new system that enables docked shuttles to draw electrical power from the station to extend visits to the outpost. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew arrives at Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 8 aboard Space Shuttle Endeavour. Commander Scott Kelly addresses media representatives. From left, behind him are Pilot Charlie Hobaugh and Mission Specialists Tracy Caldwell, Rick Mastracchio, Dave Williams (with the Canadian Space Agency), Barbara Morgan (NASA's first educator astronaut) and Alvin Drew. Endeavour's STS-118 mission is the 22nd shuttle flight to the International Space Station. It will continue space station construction by delivering a third starboard truss segment, S5. Other payloads include the SPACEHAB module, making its last voyage, and the external stowage platform 3 with a control moment gyroscope on it. The flight will include at least three spacewalks. The crew will also debut a new system that enables docked shuttles to draw electrical power from the station to extend visits to the outpost. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew arrives at Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 8 aboard Space Shuttle Endeavour. Seen here is Mission Specialist Dave Williams, with the Canadian Space Agency. Endeavour's STS-118 mission is the 22nd shuttle flight to the International Space Station. It will continue space station construction by delivering a third starboard truss segment, S5. Other payloads include the SPACEHAB module, making its last voyage, and the external stowage platform 3 with a control moment gyroscope on it. The flight will include at least three spacewalks. The crew will also debut a new system that enables docked shuttles to draw electrical power from the station to extend visits to the outpost. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew arrives at Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 8 aboard Space Shuttle Endeavour. Seen here is Mission Specialist Tracy Caldwell as she talks to the media. Endeavour's STS-118 mission is the 22nd shuttle flight to the International Space Station. It will continue space station construction by delivering a third starboard truss segment, S5. Other payloads include the SPACEHAB module, making its last voyage, and the external stowage platform 3 with a control moment gyroscope on it. The flight will include at least three spacewalks. The crew will also debut a new system that enables docked shuttles to draw electrical power from the station to extend visits to the outpost. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew arrives at Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 8 aboard Space Shuttle Endeavour. Seen here is Mission Specialist Rick Mastracchio as he talks to media representatives. Endeavour's STS-118 mission is the 22nd shuttle flight to the International Space Station. It will continue space station construction by delivering a third starboard truss segment, S5. Other payloads include the SPACEHAB module, making its last voyage, and the external stowage platform 3 with a control moment gyroscope on it. The flight will include at least three spacewalks. The crew will also debut a new system that enables docked shuttles to draw electrical power from the station to extend visits to the outpost. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew arrives at Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 8 aboard Space Shuttle Endeavour. Seen here is Pilot Charlie Hobaugh. Endeavour's STS-118 mission is the 22nd shuttle flight to the International Space Station. It will continue space station construction by delivering a third starboard truss segment, S5. Other payloads include the SPACEHAB module, making its last voyage, and the external stowage platform 3 with a control moment gyroscope on it. The flight will include at least three spacewalks. The crew will also debut a new system that enables docked shuttles to draw electrical power from the station to extend visits to the outpost. NASA/Kim Shiflett