CAPE CANAVERAL, Fla. – The tools that will be used to service NASA's Hubble Space Telescope on the STS-125 mission are displayed in the NASA News Center at NASA's Kennedy Space Center in Florida. Being held in the foreground is the grid cutter tool, which will enable removal of the Electromagnetic Interference Grid from the Advanced Camera for Surveys access cover. On space shuttle Atlantis’ STS-125 mission, Hubble will be serviced for the fifth and final time. The flight will include five spacewalks during which astronauts will refurbish and upgrade the telescope with these state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. The payload includes a Wide Field Camera 3, fine guidance sensor and the Cosmic Origins Spectrograph. Launch is scheduled for 2:01 p.m. EDT May 11. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, STS-125 crew members pose for the traditional portrait after breakfast on launch day. From left are Mission Specialists Andrew Feustel and John Grunsfeld, Pilot Gregory C. Johnson, Commander Scott Altman, and Mission Specialists Megan McArthur, Mike Massimino and Michael Good. The crew is preparing for liftoff aboard space shuttle Atlantis on the STS-125 mission to refurbish and upgrade NASA's Hubble Space Telescope with state-of-the-art science instruments. The payload includes a Wide Field Camera 3, fine guidance sensor and the Cosmic Origins Spectrograph. Atlantis' 11-day flight will include five spacewalks that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. Launch of Atlantis is scheduled for 2:01 p.m. EDT. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On the runway at the Shuttle Landing Facility, or SLF, at NASA's Kennedy Space Center in Florida, the Shuttle Training Aircraft is ready for takeoff. STS-125 Commander Scott Altman and Pilot Gregory C. Johnson are practicing shuttle landings on the SLF runway in preparation for their launch on space shuttle Atlantis, scheduled for 2:01 p.m. EDT on May 11. On Atlantis’ STS-125 mission, NASA's Hubble Space Telescope will be serviced for the fifth and final time. The flight will include five spacewalks during which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-125 Commander Scott Altman, wearing his launch-and-entry suit, sits in the cockpit of the Shuttle Training Aircraft before taking off to practice shuttle landings. He is preparing for launch of space shuttle Atlantis, scheduled for 2:01 p.m. EDT on May 11. On Atlantis’ STS-125 mission, NASA's Hubble Space Telescope will be serviced for the fifth and final time. The flight will include five spacewalks during which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – The tools that will be used to service NASA's Hubble Space Telescope on the STS-125 mission are displayed in the NASA News Center at NASA's Kennedy Space Center in Florida. In the foreground is the pistol grip tool. It can install and remove instruments, drive latches and open doors. A self-contained, high-torque drive, the tool features an on-board computer that permits users to tailor its performance to the mission demands. Behind it is the plastic version used by astronauts during practice in the water tank at NASA' Johnson Space Center. At center left are the card extraction and insertion tools to enable removal of electronic cards. And behind those is the bit caddy. On space shuttle Atlantis’ STS-125 mission, Hubble will be serviced for the fifth and final time. The flight will include five spacewalks during which astronauts will refurbish and upgrade the telescope with these state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. The payload includes a Wide Field Camera 3, fine guidance sensor and the Cosmic Origins Spectrograph. Launch is scheduled for 2:01 p.m. EDT May 11. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – On the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-125 Commander Scott Altman is wearing his complete launch-and-entry suit in the cockpit of the Shuttle Training Aircraft. He is preparing to practice shuttle landings in preparation for launch of space shuttle Atlantis, scheduled for 2:01 p.m. EDT on May 11. On Atlantis’ STS-125 mission, NASA's Hubble Space Telescope will be serviced for the fifth and final time. The flight will include five spacewalks during which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-125 Pilot Gregory C. Johnson, wearing his launch-and-entry suit, heads into the Shuttle Training Aircraft to practice shuttle landings in preparation for launch of space shuttle Atlantis, scheduled for 2:01 p.m. EDT on May 11. On Atlantis’ STS-125 mission, NASA's Hubble Space Telescope will be serviced for the fifth and final time. The flight will include five spacewalks during which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – The tools that will be used to service NASA's Hubble Space Telescope on the STS-125 mission are displayed in the NASA News Center at NASA's Kennedy Space Center in Florida. At far right is the pistol grip tool. It can install and remove instruments, drive latches and open doors. A self-contained, high-torque drive, the tool features an on-board computer that permits users to tailor its performance to the mission demands. In the foreground are the card extraction and insertion tools to enable removal of electronic cards. At top center is the plastic version of the pistol grip tool used by astronauts during practice in the water tank at NASA' Johnson Space Center. At center left is the bit caddy. On space shuttle Atlantis’ STS-125 mission, Hubble will be serviced for the fifth and final time. The flight will include five spacewalks during which astronauts will refurbish and upgrade the telescope with these state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. The payload includes a Wide Field Camera 3, fine guidance sensor and the Cosmic Origins Spectrograph. Launch is scheduled for 2:01 p.m. EDT May 11. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – On the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-125 Pilot Gregory C. Johnson, puts on the helmet of his launch-and-entry suit while sitting in the cockpit of the Shuttle Training Aircraft. He is preparing to practice shuttle landings in preparation for launch of space shuttle Atlantis, scheduled for 2:01 p.m. EDT on May 11. On Atlantis’ STS-125 mission, NASA's Hubble Space Telescope will be serviced for the fifth and final time. The flight will include five spacewalks during which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – On the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-125 Commander Scott Altman, wearing his launch-and-entry suit, heads for the Shuttle Training Aircraft to practice shuttle landings in preparation for launch of space shuttle Atlantis, scheduled for 2:01 p.m. EDT on May 11. On Atlantis’ STS-125 mission, NASA's Hubble Space Telescope will be serviced for the fifth and final time. The flight will include five spacewalks during which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Kim Shiflett