This image provided by NASA shows the International Space Station photographed by an STS-132 crew member on space shuttle Atlantis after the station and shuttle began their post-undocking relative separation Sunday May 23, 2010. (AP photo/NASA)
The space shuttle Atlantis is towed towards the orbiter processing facility Wednesday, May 26, 2010, at the Kennedy Space Center in Cape Canaveral, Florida. Atlantis and her crew of six astronauts wrapped up a 12-day mission. (AP Photo/Chris O’Meara)
NASA safety workers check for toxic gases after the space shuttle Atlantis landed on Kennedy Space Center’s runway 33 Wednesday, May 26, 2010, in Cape Canaveral, Fla. (AP Photo/Red Huber, Pool)
Space shuttle Atlantis touches down for the last time on Kennedy Space Center’s runway 33 Wednesday, May 26, 2010, in Cape Canaveral, Fla. (AP Photo/Chris O’Meara)
Moisture trails off the wings on the space shuttle Atlantis as she comes in to land at Kennedy Space Center’s runway 33 Wednesday, May 26, 2010, in Cape Canaveral, Fla. (AP Photo/Chris O’Meara)
Space shuttle Atlantis is featured in this image provided by NASA and photographed by an Expedition 23 crew member on the International Space Station soon after the shuttle and station began their relative separation Sunday May 23, 2010. Atlantis returned home early Wednesday morning May 26, 2010. (AP Photo/NASA)
This image provided by NASA shows the mobile launcher platform, supporting space shuttle Atlantis, has been secured over the flame trench on the pad’s pedestals, Thursday April 22, 2010. Atlantis is scheduled to launch May 14 at 2:19 p.m. (AP photo/NASA)
The space shuttle Discovery lands on Kennedy Space Center’s Runway 33 on Tuesday, April 20, 2010, in Cape Canaveral, Florida. (AP Photo/Pierre DuCharme, Pool)
This image provided by NOAA shows the volcanic plume, from Wednesday’s eruption of a volcano beneath Iceland’s Eyjafjallajokull glacier. Using sulfur dioxide concentration data from the NASA Aura/OMI satellite sensor, it shows smoke, ash, and other components that can cause aircraft jet engines to fail. The OMI sensor can distinguish the differences between cloud, smoke, dust, ozone and other aerosols, and is important in Earth observations for aviation safety. (AP Photo/NOAA)
Space shuttle Discovery arrives at pad 39A for launch preparations after a six hour journey from the Vehicle Assembly Building at the Kennedy Space Center in Cape Canaveral, Florida, Wednesday, March 3, 2010. Discovery is targeted for launch April 5 on a mission to the International Space Station. (AP Photo/John Raoux)
This image, obtained via Twitter, and taken by astronaut Soichi Noguchi aboard the International Space Station, shows the Sahara Desert, the first view out of the cupola’s windows on the observation deck of the Tranquility module station early Wednesday morning Feb. 17, 2010. (AP Photo/NASA via Twitter)
In this image provided by NASA, astronaut Nicholas Patrick participates in extravehicular activity as construction and maintenance continue on the International Space Station. During the spacewalk, Patrick and fellow astronaut Robert Behnken removed insulation blankets and launch restraint bolts from each of the Cupola’s seven windows. (AP Photo/NASA)
This image provided by NASA shows the silhouette of the space shuttle Endeavour in a very unique setting over Earth’s colorful horizon photographed by an Expedition 22 crew member prior to STS-130 rendezvous and docking operations with the International Space Station Tuesday Feb. 9, 2010. (AP Photo/NASA)
This image provided by NASA shows a partial view of the crew cabin and forward payload bay of the space shuttle Endeavour provided by an Expedition 22 crew member during a survey of the approaching vehicle prior to docking with the International Space Station Tuesday Feb. 9, 2010. (AP photo/NASA)
