KENNEDY SPACE CENTER, FLA. -- Framed by amber clouds of smoke, Space Shuttle Endeavour rises above Launch Pad 39A as it lifts on time at 6:36 p.m. EDT on mission STS-118. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Ken Thornsley

KENNEDY SPACE CENTER, FLA. -- Space Shuttle Endeavour paints the still-blue evening sky as it leaves Earth behind on its journey into space on mission STS-118. Liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- Clouds of smoke and steam roll across Launch Pad 39A as Space Shuttle Endeavour leaps free above them, beginning its journey on mission STS-118. Liftoff of Endeavour was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Sandra Joseph, Tony Gray, Robert Murray

KENNEDY SPACE CENTER, FLA. -- Space Shuttle Endeavour races into the sky trailing columns of fire from the solid rocket boosters as it begins mission STS-118. The liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Jerry Cannon, Mike Kerley

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Mission Specialist Alvin Drew reflects on the auspicious moment of suiting up for launch. Drew is making his first spaceflight when Space Shuttle Endeavour launches on mission STS-120. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Commander Scott Kelly dons his launch and entry suit for launch aboard Space Shuttle Endeavour. This is Kelly's second spaceflight. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Space Shuttle Endeavour appears to sit atop a long column of smoke as it hurtles into space on mission STS-118. Liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Ken Thornsley

KENNEDY SPACE CENTER, FLA. -- Photographers at NASA News Center capture the launch of Space Shuttle Endeavour as it hurtles into the evening sky on mission STS-118. Liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew waves to spectators as they head for the Astrovan. From left are Mission Specialists Alvin Drew, Barbara R. Morgan, Dave Williams and Rick Mastracchio, Pilot Charlie Hobaugh, Mission Specialist Tracy Caldwell and Commander Scott Kelly. The Astrovan will take them to Launch Pad 39A for final suit preparations before climbing into Space Shuttle Endeavour for launch at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Emerging from the billows of smoke below, Space Shuttle Endeavour hurtles into the sky on mission STS-118. Liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo courtesy of Reuters.

KENNEDY SPACE CENTER, FLA. -- Space Shuttle Endeavour breaks free from the clouds of smoke after liftoff from Launch Pad 39A on mission STS-118. The liftoff was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo courtesy of Nikon/Scott Andrews

KENNEDY SPACE CENTER, FLA. - Space Shuttle Endeavour is revealed on Launch Pad 39A after rollback of the rotating service structure, or RSS, at left of the pad. Rollback started at 9 p.m. EDT Aug. 7 and was complete at 10:40 p.m. Beneath the shuttle is the mobile launcher platform. The RSS provides protected access to the orbiter for changeout and servicing of payloads at the pad. Rollback of the pad's RSS is one of the milestones in preparation for the launch of mission STS-118 at 6:36 p.m. EDT on Aug. 8. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The suited STS-118 crew moves quickly to the Astrovan after leaving the Operations and Checkout Building. From left are Mission Specialists Barbara R. Morgan, Rick Mastracchio and Dave Williams, Pilot Charlie Hobaugh, Mission Specialist Tracy Caldwell and Commander Scott Kelly. Behind Williams is Mission Specialist Alvin Drew. The Astrovan will take them to Launch Pad 39A for final suit preparations before climbing into Space Shuttle Endeavour for launch at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Spewing smoke from the solid rocket boosters, Space Shuttle Endeavour roars into the sky on mission STS-118. The liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Jerry Cannon, Mike Kerley

KENNEDY SPACE CENTER, FLA. -- The trail of smoke from Space Shuttle Endeavour curves as the shuttle hurtles into space on mission STS-118. Liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Ken Thornsley

KENNEDY SPACE CENTER, FLA. - After rollback of the rotating service structure, or RSS, on Launch Pad 39A, Space Shuttle Endeavour stands bathed in spotlights. Rollback started at 9 p.m. EDT Aug. 7 and was complete at 10:40 p.m. Beneath the shuttle is the mobile launcher platform, which spans the flame trench below. The flame deflector system includes an inverted, V-shaped steel structure that receives and deflects the flames from the orbiter main engines on one side; the opposite side deflects the flames from the solid rocket boosters. The RSS provides protected access to the orbiter for changeout and servicing of payloads at the pad. Rollback of the pad's RSS is one of the milestones in preparation for the launch of mission STS-118 at 6:36 p.m. EDT on Aug. 8. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew enjoys a traditional meal before suiting up for launch. Seated left to right are Mission Specialists Alvin Drew and Dave Williams, Pilot Charlie Hobaugh, Commander Scott Kelly, and Mission Specialists Tracy Caldwell, Rick Mastracchio and Barbara R. Morgan, the teacher-turned-astronaut. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Mission Specialist Rick Mastracchio is helped with his helmet during suitup before launch aboard Space Shuttle Endeavour. Mastracchio is making his second spaceflight. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Commander Scott Kelly completes suitup with his helmet. Kelly is eager for liftoff aboard Space Shuttle Endeavour, scheduled at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Rising from clouds of smoke and steam, Space Shuttle Endeavour roars into the early evening sky as it lifts off Launch Pad 39A on time at 6:36 p.m. EDT on mission STS-118. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Todd Prough

KENNEDY SPACE CENTER, FLA. - Space Shuttle Endeavour is revealed on Launch Pad 39A after rollback of the rotating service structure, or RSS, at left of the pad. Rollback started at 9 p.m. EDT Aug. 7 and was complete at 10:40 p.m. Beneath the shuttle is the mobile launcher platform, which spans the flame trench below. The flame deflector system includes an inverted, V-shaped steel structure that receives and deflects the flames from the orbiter main engines on one side; the opposite side deflects the flames from the solid rocket boosters. The RSS provides protected access to the orbiter for changeout and servicing of payloads at the pad. Rollback of the pad's RSS is one of the milestones in preparation for the launch of mission STS-118 at 6:36 p.m. EDT on Aug. 8. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Mission Specialist Tracy Caldwell is helped with her helmet during suitup for launch on Space Shuttle Endeavour. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The launch of Space Shuttle Endeavour lights up the sky at sunset as it lifts off on time at 6:36 p.m. EDT on mission STS-118. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Ken Thornsley

KENNEDY SPACE CENTER, FLA. -- The nearby waters catch the fiery trail from Space Shuttle Endeavour as it roars into the sky on mission STS-118. Smoke and steam billow across Launch Pad 39A after liftoff. The liftoff was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Sandra Joseph, Tony Gray, Robert Murray

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building during suitup, STS-118 Mission Specialist Barbara R. Morgan, teacher-turned-astronaut, is eager to make her first spaceflight on mission STS-118 aboard Space Shuttle Endeavour. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Mission Specialist Tracy Caldwell is helped donning her launch and entry suit before heading to Launch Pad 39A and launch of Space Shuttle Endeavour at 6:36 p.m. EDT. 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Pilot Charlie Hobaugh is ready after suitup to head for the launch pad and board Space Shuttle Endeavour. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Mission Specialist Alvin Drew is helped with his helmet during suitup for launch on Space Shuttle Endeavour. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Space Shuttle Endeavour is revealed on Launch Pad 39A after rollback of the rotating service structure, or RSS, at left of the pad. Rollback started at 9 p.m. EDT Aug. 7 and was complete at 10:40 p.m. Beneath the shuttle is the mobile launcher platform which supports the shuttle until liftoff. The RSS provides protected access to the orbiter for changeout and servicing of payloads at the pad. Rollback of the pad's RSS is one of the milestones in preparation for the launch of mission STS-118 at 6:36 p.m. EDT on Aug. 8. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - After rollback of the rotating service structure, or RSS, on Launch Pad 39A, Space Shuttle Endeavour stands bathed in spotlights. Rollback started at 9 p.m. EDT Aug. 7 and was complete at 10:40 p.m. Beneath the shuttle is the mobile launcher platform which supports the shuttle until liftoff. The RSS provides protected access to the orbiter for changeout and servicing of payloads at the pad. Rollback of the pad's RSS is one of the milestones in preparation for the launch of mission STS-118 at 6:36 p.m. EDT on Aug. 8. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Space Shuttle Endeavour leaps free from the clouds of smoke and steam across Launch Pad 39A after liftoff on mission STS-118. The liftoff was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo courtesy of Nikon/Scott Andrews

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Mission Specialist Dave Williams is helped adjusting his helmet as he suits up for launch. Williams, who is making his second spaceflight, represents the Canadian Space Agency. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Space Shuttle Endeavour soars through the sky as it begins its journey on mission STS-118 to the International Space Station. The liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Jerry Cannon, Mike Kerley

KENNEDY SPACE CENTER, FLA. -- Space Shuttle Endeavour climbs above the fixed service structure on Launch Pad 39A as it begins its journey on mission STS-118. Liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- Emerging from the billows of smoke below, Space Shuttle Endeavour clears the lightning mast on the fixed service structure below to begin its journey on mission STS-118. Liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo courtesy of Nikon/Scott Andrews

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew strides out of the Operations and Checkout Building eager to get to Launch Pad 39A for launch of Space Shuttle Endeavour at 6:36 p.m. EDT. Seen here are (left to right) Mission Specialists Alvin Drew, teacher-turned-astronaut Barbara R. Morgan, and Dave Williams, who represents the Canadian Space Agency. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- NASA Administrator Mike Griffin (front) and Associate Administrator for NASA Space Operations Mission William Gerstenmaier (right) watch the launch of Space Shuttle Endeavour on mission STS-118 from the Launch Control Center at Kennedy Space Center. The liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Bill Ingalls

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building during suitup, STS-118 Mission Specialist Barbara R. Morgan, teacher-turned-astronaut, is helped with her helmet for launch aboard Space Shuttle Endeavour. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- A spider suspended between trees in the foreground has a perfect view of Space Shuttle Endeavour as it roars into the sky on mission STS-118. The rumbling sound of liftoff startles birds flying above. Liftoff of Endeavour from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Sandra Joseph, Tony Gray, Robert Murray

KENNEDY SPACE CENTER, FLA. -- The STS-118 crew stride out of the Operations and Checkout Building eager to get to Launch Pad 39A for launch of Space Shuttle Endeavour at 6:36 p.m. EDT. Leading the way are (left and right) Pilot Charlie Hobaugh and Commander Scott Kelly. Behind them, clockwise, are Mission Specialists Rick Mastracchio, teacher-turned-astronaut Barbara Morgan, Alvin Drew, Dave Williams and Tracy Caldwell. Williams represents the Canadian Space Agency. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Framed by the trees across the water, Space Shuttle Endeavour roars into the sky as it rises from clouds of smoke and steam billowing across Launch Pad 39A. Liftoff of Endeavour from Launch Pad 39A on mission STS-118 was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Sandra Joseph, Tony Gray, Robert Murray

KENNEDY SPACE CENTER, FLA. -- As billows of smoke spread across Launch Pad 39A, Space Shuttle Endeavour climbs into the sky on mission STS-118. Liftoff was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Sandra Joseph, Tony Gray, Robert Murray

KENNEDY SPACE CENTER, FLA. - The orbiter access arm is positioned against Space Shuttle Endeavour after rollback of the rotating service structure, or RSS, on Launch Pad 39A. At the end of the arm is a clean room from which the astronauts enter the crew compartment of the orbiter for launch. Rollback started at 9 p.m. EDT Aug. 7 and was complete at 10:40 p.m. The RSS provides protected access to the orbiter for changeout and servicing of payloads at the pad. Rollback of the pad's RSS is one of the milestones in preparation for the launch of mission STS-118 at 6:36 p.m. EDT on Aug. 8. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Framed by a backglow from its fiery tail, Space Shuttle Endeavour leaps clear of Launch Pad 39A on its journey into space on mission STS-118. Liftoff was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Sandra Joseph, Tony Gray, Robert Murray

KENNEDY SPACE CENTER, FLA. -- Emerging from the billows of smoke below, Space Shuttle Endeavour hurtles into the sky on mission STS-118. Liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. Liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo courtesy of Nikon/Scott Andrews

KENNEDY SPACE CENTER, FLA. -- Framed by the trees across the water, Space Shuttle Endeavour clears the lightning mast on Launch Pad 39A as it roars into the sky on mission STS-118. Liftoff of Endeavour was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Sandra Joseph, Tony Gray, Robert Murray

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Mission Specialist Dave Williams is donning his launch and entry suit before heading to Launch Pad 39A and launch of Space Shuttle Endeavour at 6:36 p.m. EDT. Williams represents the Canadian Space Agency. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Associate Administrator for NASA Space Operations Mission William Gerstenmaier (right) watches the launch of Space Shuttle Endeavour on mission STS-118 from the Launch Control Center at Kennedy Space Center. The liftoff from Launch Pad 39A was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Bill Ingalls

KENNEDY SPACE CENTER, FLA. -- In the Operations and Checkout Building, STS-118 Mission Specialist Rick Mastracchio gets help with his boot after donning his launch and entry suit in preparation for launch aboard Space Shuttle Endeavour. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Clouds of smoke and steam roil across Launch Pad 39A as Space Shuttle Endeavour hurtles into the early evening sky on mission STS-118. The liftoff was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo courtesy of Nikon/Scott Andrews

KENNEDY SPACE CENTER, FLA. - The orbiter access arm is positioned against Space Shuttle Endeavour after rollback of the rotating service structure, or RSS, on Launch Pad 39A. At the end of the arm is a clean room from which the astronauts enter the crew compartment of the orbiter for launch. Rollback started at 9 p.m. EDT Aug. 7 and was complete at 10:40 p.m. The RSS provides protected access to the orbiter for changeout and servicing of payloads at the pad. Rollback of the pad's RSS is one of the milestones in preparation for the launch of mission STS-118 at 6:36 p.m. EDT on Aug. 8. Space Shuttle 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Deep shadows are broken by the fiery launch of Space Shuttle Endeavour as it leaps free of Launch Pad 39A to begin mission STS-118. Liftoff was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: NASA/Sandra Joseph, Tony Gray, Robert Murray

KENNEDY SPACE CENTER, FLA. -- Fiery clouds of smoke stream across Launch Pad 39A as Space Shuttle Endeavour lifts off on mission STS-118. The liftoff was on time at 6:36 p.m. EDT. The 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, and other payloads such as the SPACEHAB module and the external stowage platform 3. The 11-day mission may be extended to as many as 14 depending on the test of the Station-to-Shuttle Power Transfer System that will allow the docked shuttle to draw electrical power from the station and extend its visits to the orbiting lab. Photo credit: Jerry Cannon, Mike Kerley