NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 08: A K-9 officer and his dog exit the Astrovan before the crew of space shuttle Atlantis STS-135 take the vehicle to the launch pad hours before their scheduled launch at Kennedy Space Center July 7, 2011 in Cape Canaveral, Florida. Bad weather conditions threaten Atlantis' launch, which will mark the final liftoff in the 30-year-old space shuttle program. (Photo by Chip Somodevilla/Getty Images)

The US space shuttle Atlantis sits on La

The US space shuttle Atlantis sits on Launch Pad 39A July 7, 2011 at Kennedy Space Center in Florida. Preparations continue for the scheduled July 8 launch of STS-135, the final flight of the shuttle program. AFP PHOTO/DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 07: In this handout provided by National Aeronautics and Space Administration (NASA), the space shuttle Atlantis is revealed as the rotating service structure is rolled back at pad 39a on July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Florida. Space shuttle Atlantis is set to lift off tomorrow, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. (Photo by Bill Ingalls/NASA via Getty Images)

The US space shuttle Atlantis sits on La

The US space shuttle Atlantis sits on Launch Pad 39A July 7, 2011 at Kennedy Space Center in Florida. Preparations continue for the scheduled July 8 launch of STS-135, the final flight of the shuttle program. AFP PHOTO/DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 07: In this handout provided by National Aeronautics and Space Administration (NASA), the space shuttle Atlantis is seen shortly after the rotating service structure (RSS) was rolled back at launch pad 39a on July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Florida. Space shuttle Atlantis is set to lift off tomorrow, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. (Photo by Bill Ingalls/NASA via Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 07: In this handout provided by National Aeronautics and Space Administration (NASA), the space shuttle Atlantis is seen shortly after the rotating service structure (RSS) was rolled back at launch pad 39a on July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Florida. Space shuttle Atlantis is set to lift off tomorrow, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. (Photo by Bill Ingalls/NASA via Getty Images)

A spider rests in its web while the spac

A spider rests in its web while the space shuttle Atlantis rotating service structure is rolled back on July 7, 2011 at Kennedy Space Center in Florida. Preparations continue for the July 8 launch of STS-135, the final flight of the shuttle program AFP PHOTO/Jim WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)

The space shuttle Atlantis is seen as th

The space shuttle Atlantis is seen as the rotating service structure (L) is rolled back on July 7, 2011 at Kennedy Space Center in Florida. Preparations continue for the July 8 launch of STS-135, the final flight of the shuttle program AFP PHOTO/Jim WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 08: Spectators wave as the "Astrovan" carrying the space shuttle astronauts makes its way to the launchpad at the Kennedy Space Center July 8, 2011 in Cape Canaveral, Florida. Atlantis is scheduled to lift off today, making it NASA's final space shuttle launch. (Photo by Win McNamee/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 08: (L-R) Space shuttle Atlantis STS-135 pilot Douglas Hurley, mission specialist Sandra Magnus, commander Christopher Ferguson and mission specialist Rex Walheim walk out of the NASA Operations and Checkout building hours before their scheduled launch at Kennedy Space Center July 7, 2011 in Cape Canaveral, Florida. Bad weather conditions threaten Atlantis' scheduled launch today on a 12-day mission to the International Space Station, the 135th and final NASA space shuttle launch, that will mark the end of the 30-year-old NASA space shuttle program. (Photo by Chip Somodevilla/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 08: A Japanese journalist hangs a sign for the crew of the space shuttle Atlantis STS-135 the NASA Operations and Checkout building hours before their scheduled launch at Kennedy Space Center July 7, 2011 in Cape Canaveral, Florida. Bad weather conditions threaten Atlantis' launch, which will mark the final liftoff in the 30-year-old space shuttle program. (Photo by Chip Somodevilla/Getty Images)

Crew of the space shuttle Atlantis walk

Crew of the space shuttle Atlantis walk out before heading to the launch pad July 8, 2011 at Kennedy Space Center in Florida in advance of the 11:26 a.m. (EDT) launch of STS-135, the final flight of the shuttle program. Leading the crew is commander Chris Ferguson (R, front), pilot Doug Hurley (L, front), followed by mission specialists Sandy Magnus (L, rear) and Rex Walheim (R, rear). Atlantis is poised to blaze a path into history Friday when it propels toward the heavens on the last-ever mission of the 30-year-old American space shuttle program. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

Crew of the space shuttle Atlantis walk

Crew of the space shuttle Atlantis walk out before heading to the launch pad July 8, 2011 at Kennedy Space Center in Florida in advance of the 11:26 a.m. (EDT) launch of STS-135, the final flight of the shuttle program. Leading the crew is commander Chris Ferguson (R), pilot Doug Hurley (2nd R), followed by mission specialists Rex Walheim (2nd R) and Sandy Magnus (L). Atlantis is poised to blaze a path into history Friday when it propels toward the heavens on the last-ever mission of the 30-year-old American space shuttle program. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 8: Space Shuttle Atlantis Astronauts, Mission Specialist Sandra Magnus (from left), Pilot Doug Hurley, and Commander Chris Ferguson walkout from the Operations and Checkout Building to the Astrovan in preparation for the countdown in Cape Canaveral, Florida. After this mission STS-135 the Space Shuttle program will come to an end. (Photo by Roberto Gonzalez/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 8: Space Shuttle Atlantis Astronauts, Pilot Doug Hurley, and Commander Chris Ferguson (front row from left), and Mission Specialists Sandra Magnus, and Rex Walheim, walkout from the Operations and Checkout Building to the Astrovan in preparation for the countdown in Cape Canaveral, Florida. After this mission STS-135 the Space Shuttle program will come to an end. (Photo by Roberto Gonzalez/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 8: Space Shuttle Atlantis Astronauts, Mission Specialists Rex Walheim, Sandra Magnus, Pilot Doug Hurley, and Commander Chris Ferguson walkout from the Operations and Checkout Building into the Astrovan in preparation for the countdown in Cape Canaveral, Florida. After Atlantis mission STS-135 the Space Shuttle program will come to an end. (Photo by Roberto Gonzalez/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 08: Larry Moore of McRae Art Studios in Orlando, Florida, works on a painting of the space shuttle Atlantis STS-135 at the press site at Kennedy Space Center two hours before the shuttle's launch July 8, 2011 in Cape Canaveral, Florida. Bad weather conditions threaten Atlantis' scheduled launch today on a 12-day mission to the International Space Station, the 135th and final NASA space shuttle launch, that will mark the end of the 30-year-old NASA space shuttle program. (Photo by Chip Somodevilla/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 08: Rabbi Zvi Konikov of Satellite Beach Chabad in Brevard, Florida, prays at the press site at Kennedy Space Center before the launch of space shuttle Atlantis STS-135 July 8, 2011 in Cape Canaveral, Florida. Bad weather conditions threaten Atlantis' scheduled launch today on a 12-day mission to the International Space Station, the 135th and final NASA space shuttle launch, that will mark the end of the 30-year-old NASA space shuttle program. (Photo by Chip Somodevilla/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 08: Photographers prepare for the launch of space shuttle Atlantis STS-135 at the press site at Kennedy Space Center two hours before launch July 8, 2011 in Cape Canaveral, Florida. Bad weather conditions threaten Atlantis' scheduled launch today on a 12-day mission to the International Space Station, the 135th and final NASA space shuttle launch, that will mark the end of the 30-year-old NASA space shuttle program. (Photo by Chip Somodevilla/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 08: (L-R) Ted Leatherwood, Karen Leatherwood, Allen Wilson, David Wilson, and Christopher Wilson hold a "Wish You Were Here" sign for brother Joe Wilson from Maryland as they await the launch of Space Shuttle Atlantis July 8, 2011 in Cape Canaveral, Florida. Bad weather conditions threaten Atlantis' scheduled launch today on a 12-day mission to the International Space Station, the 135th and final NASA space shuttle launch, that will mark the end of the 30-year-old NASA space shuttle program. (Photo by Win McNamee/Getty Images)

NASA's Final Space Shuttle Flight Lifts Off From Cape Canaveral

CAPE CANAVERAL, FL - JULY 08: A spectator reacts as Space Shuttle Atlantis lifts off during the final space shuttle mission from the Kennedy Space Center July 8, 2011 in Cape Canaveral, Florida. This is the final launch of the space shuttle program, which began in 1981. The total miles flown by all of the space shuttles are 537,114,016. (Photo by Win McNamee/Getty Images)

NASA's Final Space Shuttle Flight Lifts Off From Cape Canaveral

CAPE CANAVERAL, FL - JULY 08: Space shuttle Atlantis blasts off from launch pad 39A at Kennedy Space Centern July 8, 2011 in Cape Canaveral, Florida. This lift off is the last in the 30-year-old shuttle program. (Photo by Chip Somodevilla/Getty Images)

NASA's Final Space Shuttle Flight Lifts Off From Cape Canaveral

CAPE CANAVERAL, FL - JULY 08: Space shuttle Atlantis blasts off from launch pad 39A at Kennedy Space Centern July 8, 2011 in Cape Canaveral, Florida. This lift off is the last in the 30-year-old shuttle program. (Photo by Chip Somodevilla/Getty Images)

NASA's Final Space Shuttle Flight Lifts Off From Cape Canaveral

CAPE CANAVERAL, FL - JULY 08: Space shuttle Atlantis blasts off from launch pad 39A at Kennedy Space Centern July 8, 2011 in Cape Canaveral, Florida. This lift off is the last in the 30-year-old shuttle program. (Photo by Chip Somodevilla/Getty Images)

NASA's Final Space Shuttle Flight Lifts Off From Cape Canaveral

CAPE CANAVERAL, FL - JULY 08: Space shuttle Atlantis blasts off from launch pad 39A at Kennedy Space Centern July 8, 2011 in Cape Canaveral, Florida. This lift off is the last in the 30-year-old shuttle program. (Photo by Chip Somodevilla/Getty Images)

NASA Research Center Celebrates Atlantis Launch

MOFFETT FIELD, CA - JULY 08: A man watches a video replay of the launch of space shuttle Atlantis from launch pad 39A at Kennedy Space Center on July 8, 2011 in Moffett Field, California. Space shuttle Atlantis is the final lift off in the 30-year-old shuttle program. (Photo by Justin Sullivan/Getty Images)

NASA Research Center Celebrates Atlantis Launch

MOFFETT FIELD, CA - JULY 08: Five year-old Lux Sparks-Pescovitz (R) and his father David Pescovitz (L) watch a live video feed of the launch of space shuttle Atlantis at the NASA reseach center on July 8, 2011 in Moffett Field, California. Space shuttle Atlantis is the final lift off in the 30-year-old shuttle program. (Photo by Justin Sullivan/Getty Images)

The space shuttle Atlantis lifts off Jul

The space shuttle Atlantis lifts off July 8, 2011 at Kennedy Space Center in Florida for the final flight of the shuttle program. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

NASA's Final Space Shuttle Flight Lifts Off From Cape Canaveral

CAPE CANAVERAL, FL - JULY 08: Kennedy Space Center employee Lisa Gorichky cries as Space Shuttle Atlantis lifts off during the final space shuttle mission from the Kennedy Space Center on Cape Canaveral, Florida July 8, 2011. This is the final launch of the space shuttle program, which began in 1981. The total miles flown by all of the space shuttles are 537,114,016. (Photo by Win McNamee/Getty Images)

NASA Prepares For Launch Of Space Shuttle Atlantis

CAPE CANAVERAL, FL - JULY 07: In this handout provided by National Aeronautics and Space Administration (NASA), the space shuttle Atlantis is revealed as the rotating service structure is rolled back at pad 39a on July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Florida. Space shuttle Atlantis is set to lift off tomorrow, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. (Photo by Bill Ingalls/NASA via Getty Images)