Associate Administrator for NASA's Science Mission Directorate and former astronaut John M. Grunsfeld talked to the attendees of the The American Geophysical Union (AGU) meet at the Moscone Center in San Francisco, California. New results presented at the meeting show atmospheric rivers, significant sources of rainfall, tend to intensify during Nino events, and this years strong El Nino likely will bring more precipitation to California and some relief for the drought.

STS081-E-05144 (13 Jan. 1997) --- Making sure everything is in its place is no easy task as witnessed by the serious countenance of astronaut John M. Grunsfeld, mission specialist. Grunsfeld communicates with ground controllers as he checks progress of item transfers in the Spacehab Double Module (DM). This image was recorded with an Electronic Still Camera (ESC) and was later downlinked to flight controllers in Houston, Texas. Grunsfeld and five astronaut crew mates are preparing for a scheduled mid-week docking with Russia's Mir Space Station.

STS103-332-021 (19-27 December 1999) --- Astronaut John M. Grunsfeld, who.participated in two of the three STS-103 space walks to service the Hubble Space Telescope (HST), dons an extravehicular mobility unit (EMU) space suit for one of the walks. Grunsfeld is wearing the liquid cooling and ventilation garment that complements the EMU.

JSC2000-06750 (October 2000) --- Astronaut John M. Grunsfeld, mission specialist.

JSC2000-06749 (October 2000) --- Astronaut John M. Grunsfeld, mission specialist.

S125-E-006501 (12 May 2009) --- Astronaut John Grunsfeld, mission specialist, helps with unpacking chores on Atlantis? mid deck during the STS-125 flight?s second day in space. The next several days prove to be very busy for the entire crew, as five spacewalks, three of which will have the veteran Grunsfeld leaving the shirt sleeved environment of the shuttle, are in the offing.

STS109-E-5419 (7 March 2002) --- Flight Day 7 of the STS-109 mission finds payload commander John M. Grunsfeld back in the shirt-sleeve environment of the Space Shuttle Columbia. Two of Grunsfeld's crewmates were about to begin the fourth space walk of the mission to perform special tasks on the Hubble Space Telescope (HST). Grunsfeld will participate in the fifth and final scheduled spacewalk in a little more than 24 hours. It will mark his third space walk for the current mission. This image was recorded with a digital still camera.

STS109-E-5290 (4 March 2002) --- Astronaut John M. Grunsfeld, payload commander, returns to the shirt-sleeve environment of the Space Shuttle Columbia's aft flight deck. Having completed a seven-hour space walk, Grunsfeld enters data in a lap top computer. Astronauts Grunsfeld and Richard M. Linnehan successfully replaced the Hubble Space Telescope's starboard solar array and are scheduled for two more space walks this week. The image was recorded with a digital still camera.

STS103-E-5243 (22 December 1999) --- Astronaut John M. Grunsfeld, mission specialist, on Discovery's mid deck wearing the thermal undergarment which complements the extravehicular mobility unit (EMU) space suit. Grunsfeld joined astronaut Steven L. Smith for the first scheduled space walk on this the third NASA visit to HST. This photo was taken with an electronic still camera (ESC).

S125-E-007207 (14 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the first of his crew's five scheduled spacewalks in five consecutive days to perform the final hands-on servicing of the Hubble Space Telescope. Grunsfeld and his crewmate, astronaut Andrew Feustel, are slated for three of the five sessions.

STS109-E-5382 (6 March 2002) --- Astronaut John M. Grunsfeld, payload commander, waves at a crewmate inside Space Shuttle Columbia's crew cabin during a brief break in work on the Hubble Space Telescope (HST) in the cargo bay of the shuttle during the STS-109 mission's third space walk. The primary purpose of the extravehicular activity (EVA) of astronauts Grunsfeld and Richard M. Linnehan was to replace the Power Control Unit on the giant telescope. The image was recorded with a digital still camera by one of Grunsfeld's crew mates inside Columbia's cabin.

STS109-E-5381 (6 March 2002) --- Astronaut John M. Grunsfeld, payload commander, gives a "thumbs up" signal to crewmates inside Space Shuttle Columbia's crew cabin during a task on the Hubble Space Telescope (HST) in the cargo bay of the shuttle during the STS-109 mission's third space walk. The primary purpose of the extravehicular activity (EVA) of astronauts Grunsfeld and Richard M. Linnehan was to replace the Power Control Unit on the giant telescope. The image was recorded with a digital still camera by one of Grunsfeld's crew mates inside Columbia's cabin.

STS109-E-5377 (6 March 2002) --- Astronaut John M. Grunsfeld, payload commander, works in tandem with astronaut Richard M. Linnehan, mission specialist, as the two devote their attention to the Power Control Unit replacement task on the giant Hubble Space Telescope (HST). Grunsfeld stands on a foot restraint on the end of the Space Shuttle Columbia's Remote Manipulator System (RMS). This marked the third of five scheduled STS-109 space walks and the mission's second extravehicular activity (EVA) for the tandem of Grunsfeld and Linnehan. It was completed at 9:16 a.m. CST (1516 GMT), Mar. 6, 2002. The image was recorded with a digital still camera.

STS109-E-5380 (6 March 2002) --- Astronaut John M. Grunsfeld, payload commander, waves at a crewmate inside Space Shuttle Columbia's crew cabin during a brief break in work on the Hubble Space Telescope (HST) in the cargo bay of the shuttle during the STS-109 mission's third space walk. The primary purpose of the extravehicular activity (EVA) of astronauts Grunsfeld and Richard M. Linnehan was to replace the Power Control Unit on the giant telescope. The image was recorded with a digital still camera by one of Grunsfeld's crew mates inside Columbia's cabin.

Students listen intently while Astronaut John Mace Grunsfeld speaks at NASA's Earth Day event. The event took place at Union Station in Washington, DC on April 22, 2014. Photo Credit: (NASA/Aubrey Gemignani)

STS109-315-007 (8 March 2002) --- Astronaut John M. Grunsfeld, STS-109 payload commander, anchored on the end of the Space Shuttle Columbia’s Remote Manipulator System (RMS) robotic arm, moves toward the giant Hubble Space Telescope (HST) temporarily hosted in the orbiter’s cargo bay. Astronaut Richard M. Linnehan (out of frame) works in tandem with Grunsfeld during this fifth and final session of extravehicular activity (EVA). Activities for the space walk centered around the Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) to install a Cryogenic Cooler and its Cooling System Radiator.

STS109-E-5721 (8 March 2002) --- Astronaut John M. Grunsfeld, STS-109 payload commander, attired in the extravehicular mobility unit (EMU) space suit, completed suited is in the Space Shuttle Columbia’s airlock. Grunsfeld and Richard M. Linnehan, mission specialist, were about to participate in STS-109’s fifth space walk. Activities for EVA-5 centered around the Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) to install a Cryogenic Cooler and its Cooling System Radiator. The image was recorded with a digital still camera.

STS081-E-5001 (12 Jan. 1997) --- Aboard the Space Shuttle Atlantis on its first day in orbit for the mission, astronaut John M. Grunsfeld, mission specialist, begins to input mission data on a lap top general purpose computer. Grunsfeld and five crew mates are flying the Spacehab Double Module (DM), replete with supplies for the three-man crew aboard Russia's Mir Space Station with which Atlantis will be docking later in the week. The scene was recorded with an Electronic Still Camera (ESC) and later downlinked to flight controllers in Houston, Texas.

STS109-E-5448 (4 March 2002) --- Astronaut John M. Grunsfeld, payload commander, peers into the crew cabin of the Space Shuttle Columbia during the first STS-109 extravehicular activity (EVA-1) on March 4, 2002. Grunsfeld's helmet visor displays a mirrored image of the Earth's hemisphere. Astronauts Grunsfeld and Richard M. Linnehan replaced the starboard solar array on the Hubble Space Telescope (HST) on the first of five scheduled STS-109 space walks. The lower portion of the giant telescope can be seen over Grunsfeld's left shoulder. The image was recorded with a digital still camera by a crewmate on shuttle's aft flight deck.

S103-E-5209 --- Astronauts Steven L. Smith (bottom), payload commander, and John M. Grunsfeld, mission specialist, perform servicing tasks on the temporarily-captured Hubble Space Telescope (HST). Grunsfeld is on a foot restraint connected to Discovery's remote manipulator system (RMS) robot arm. Smith, making his second servicing visit to HST, is using handrails on the telescope. The photo was taken with an electronic still camera (ESC).

STS-103 mission specialist John M. Grunsfeld (attached to a workstation on the RMS arm) and payload commander Steven L. Smith (free-floating) perform a changeout of the Rate Sensor Units (RSU) in one of the bays of -V3 plane of the Hubble Space Telescope (HST). This repair was performed during the first of three extravehicular activities (EVAs) of the mission. Grunsfeld is distinguished by having no marks on his EMU and Smith is distinguished by the red strip on the pants of his EMU.

STS-103 mission specialist John M. Grunsfeld (attached to a workstation on the RMS arm) and payload commander Steven L. Smith (free-floating) perform a changeout of the Rate Sensor Units (RSU) in one of the bays of -V3 plane of the Hubble Space Telescope (HST). This repair was performed during the first of three extravehicular activities (EVAs) of the mission. Grunsfeld is distinguished by having no marks on his EMU and Smith is distinguished by the red strip on the pants of his EMU.

S125-E-009713 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009712 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

STS109-E-5225 (4 March 2002) --- Astronaut John M. Grunsfeld, payload commander, signals readiness for the first the first of his assigned STS-109 space walks to perform work on the Hubble Space Telescope (HST). Astronauts Grunsfeld and Richard M. Linnehan moments later egressed the Space Shuttle Columbia's airlock, eventually replacing the giant telescope’s starboard solar array during a space walk that ended at 7:38 a.m. (CST) or 13:38 GMT March 4, 2002.

S125-E-009593 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009688 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009683 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-007236 (14 May 2009) --- Astronaut John Grunsfeld performs work on the Hubble Space Telescope as the first of five STS-125 spacewalks kicks off a week?s worth of work on the orbiting observatory. Grunsfeld, a spacewalk veteran with a long relationship with the telescope, will participate in two of the remaining four sessions of extravehicular activity later in the mission.

JSC2008-E-118405 (26 Sept. 2008) --- Astronauts Gregory C. Johnson (left), STS-125 pilot; John Grunsfeld and Mike Massimino, both mission specialists, discuss training activities in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Grunsfeld is wearing a training version of his Extravehicular Mobility Unit (EMU) spacesuit.

S125-E-009591 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009690 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

STS109-E-5660 (6 March 2002) --- Astronauts John M. Grunsfeld (top) and Richard M. Linnehan participate in a 6 hour, 48 minute space walk designed to install a new Power Control Unit (PCU) on the Hubble Space Telescope (HST). The two went on to replace the original unit launched with the telescope in April 1990. Grunsfeld is on the end of Columbia's Remote Manipulator System (RMS) robotic arm, controlled from inside the crew cabin by astronaut Nancy J. Currie. The image was recorded with a digital still camera.

S125-E-009599 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009595 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009696 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S103-E-5208 --- Astronauts Steven L. Smith (bottom), payload commander, and John M. Grunsfeld, mission specialist, perform servicing tasks on the temporarily-captured Hubble Space Telescope (HST). Grunsfeld is on a foot restraint connected to Discovery's remote manipulator system (RMS) robot arm. Smith, making his second servicing visit to HST, is using handrails on the telescope. The photo was taken with an electronic still camera (ESC).

S125-E-007225 (14 May 2009) --- Astronaut John Grunsfeld performs work on the Hubble Space Telescope as the first of five STS-125 spacewalks kicks off a week?s worth of work on the orbiting observatory. Grunsfeld, a spacewalk veteran with a long relationship with the telescope, will participate in two of the remaining four sessions of extravehicular activity later in the mission.

S125-E-009717 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

STS081-360-003 (12-22 Jan. 1997) --- Astronaut John M. Grunsfeld performs an inflight maintenance (IFM) task to re-activate power cables connected to experiments in the Spacehab Double Module (DM), onboard the Space Shuttle Atlantis.

NASA Associate Administrator for Science Mission Directorate John Grunsfeld talks during a NASA Future Forum panel discussion at The Ohio State University on, Monday, Feb. 20, 2012, in Columbus, Ohio. Monday marked the 50th anniversary of Glenn's historic flight as the first American to orbit Earth. Photo Credit: (NASA/Bill Ingalls)

S103-E-5197 (21 Dec. 1998) --- Astronaut John M. Grunsfeld, mission specialist, checks a cable connection on Discovery's mid deck during Flight Day 2 activity. Astronaut Steven L. Smith, payload commander, is partially visible in the electronic still camera's (ESC) frame, recorded at 11:10:22 GMT, Dec. 21, 1999.

S125-E-006621 (13 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, works with a power tool on the middeck of Space Shuttle Atlantis as he prepares for upcoming spacewalks to repair the Hubble Space Telescope.

STS109-E-5904 (9 March 2002) --- Astronaut John M. Grunsfeld, STS-109 payload commander, holds a camera on the aft flight deck of the Space Shuttle Columbia. The image was recorded with a digital still camera.

S125-E-007862 (16 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, is about to attach a tether during a May 16 spacewalk to perform work on the Hubble Space Telescope.

STS109-E-5447 (4 March 2002) --- Astronaut John M. Grunsfeld, payload commander, peers into the crew cabin of the Space Shuttle Columbia during the first STS-109 extravehicular activity (EVA-1) on March 4, 2002. Grunsfeld's helmet visor displays a mirrored image of the Earth's hemisphere. Astronauts Grunsfeld and Richard M. Linnehan replaced the starboard solar array on the Hubble Space Telescope (HST) on the first of five scheduled STS-109 space walks. The image was recorded with a digital still camera by a crewmate on shuttle's aft flight deck.

STS109-E-5750 (8 March 2002) --- Astronaut John M. Grunsfeld, STS-109 payload commander, floats near the giant Hubble Space Telescope (HST) temporarily hosted in the Space Shuttle Columbia’s cargo bay. Astronaut Richard M. Linnehan (lower right), mission specialist, works in tandem with Grunsfeld during this fifth and final scheduled space walk. Activities for EVA-5 centered around the Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) to install a Cryogenic Cooler and its Cooling System Radiator. The space walk was completed at 10:06 a.m. CST (1606 GMT), March 8, 2002. The image was recorded with a digital still camera.

S125-E-008246 (16 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s third session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the six-hour, 36-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, removed the Corrective Optics Space Telescope Axial Replacement and installed in its place the new Cosmic Origins Spectrograph. They also completed the Advanced Camera for Surveys electronic card replacement work, and completed part 2 of the ACS repair, installing a new electronics box and cable.

S125-E-009646 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009648 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-008284 (16 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s third session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the six-hour, 36-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, removed the Corrective Optics Space Telescope Axial Replacement and installed in its place the new Cosmic Origins Spectrograph. They also completed the Advanced Camera for Surveys electronic card replacement work, and completed part 2 of the ACS repair, installing a new electronics box and cable.

S125-E-007867 (16 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s third session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the six-hour, 36-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, removed the Corrective Optics Space Telescope Axial Replacement and installed in its place the new Cosmic Origins Spectrograph. They also completed the Advanced Camera for Surveys electronic card replacement work, and completed part 2 of the ACS repair, installing a new electronics box and cable.

S125-E-009606 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009664 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009654 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

STS109-E-5221 (4 March 2002) --- Astronaut John M. Grunsfeld, payload commander, signals readiness for the first the first of his assigned STS-109 space walks to perform work on the Hubble Space Telescope (HST). Astronauts Grunsfeld and Richard M. Linnehan later donned their helmets and the remainder pieces of their extravehicular mobility unit (EMU) space suits and egressed the Space Shuttle Columbia, eventually replacing the giant telescope’s starboard solar array during a space walk that ended at 7:38 a.m. (CST) or 13:38 GMT March 4, 2002.

S125-E-007866 (16 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, participates in the mission?s third session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the six-hour, 36-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, removed the Corrective Optics Space Telescope Axial Replacement and installed in its place the new Cosmic Origins Spectrograph. They also completed the Advanced Camera for Surveys electronic card replacement work, and completed part 2 of the ACS repair, installing a new electronics box and cable.

S125-E-009605 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009656 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009612 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009609 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009607 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009859 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), and astronaut Andrew Feustel (bottom center), mission specialist, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-007789 (15 May 2009) --- Astronaut John Grunsfeld signals "thumbs up" to indicate two of his crewmates coming inside from a lengthy space walk are "home." Grunsfeld had just opened the hatch that leads from the mid deck to the airlock. Completing this day's session of extravehicular activity and in the airlock when this photo was made were astronauts Mike Massimino and Michael Good.

S125-E-007223 (14 May 2009) --- Astronaut John Grunsfeld performs work on the Hubble Space Telescope as the first of five STS-125 spacewalks kicks off a week?s worth of work on the orbiting observatory. Grunsfeld, a spacewalk veteran with a long relationship with the telescope, will participate in two of the remaining four sessions of extravehicular activity later in the mission.

S125-E-007853 (16 May 2009) --- Astronaut Andrew Feustel, STS-125 mission specialist, navigates near the Hubble Space Telescope on the end of the remote manipulator system arm, controlled from inside Atlantis? crew cabin. Astronaut John Grunsfeld signals to his crewmate from just a few feet away. Astronauts Feustel and Grunsfeld were continuing servicing work on the giant observatory, locked down in the cargo bay of the shuttle.

S125-E-009603 (18 May 2009) --- Astronauts John Grunsfeld (left) and Andrew Feustel, both STS-125 mission specialists, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009721 (18 May 2009) --- Astronauts John Grunsfeld (left) and Andrew Feustel, both STS-125 mission specialists, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009667 (18 May 2009) --- Astronauts John Grunsfeld (left) and Andrew Feustel, both STS-125 mission specialists, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009706 (18 May 2009) --- Astronauts John Grunsfeld (left) and Andrew Feustel, both STS-125 mission specialists, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

STS067-377-008 (2-18 March 1995) --- Astronaut John M. Grunsfeld, mission specialist, uses a handheld Hasselblad camera to record the Astro-2 payload. Orbiting Earth at 190 nautical miles, Grunsfeld joined four other NASA astronauts and two scientists for almost 17 days conducting research in support of the Astro-2 mission.

S125-E-009718 (18 May 2009) --- Astronauts John Grunsfeld (bottom) and Andrew Feustel, both STS-125 mission specialists, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S103-E-5204 --- Astronauts Steven L. Smith (right), payload commander, and John M. Grunsfeld use the Canadian-built remote manipulator system (RMS) robot arm to perform servicing tasks on the temporarily-captured Hubble Space Telescope (HST). The photo was taken with an electronic still camera.

S125-E-007182 (14 May 2009) --- Astronauts John Grunsfeld (left) and Andrew Feustel, STS-125 mission specialists, made up the May 14 team of space walkers assigned to begin the final work on the Hubble Space Telescope. They will share two more sessions of extravehicular session later in the week.

JSC2008-E-118429 (26 Sept. 2008) --- Astronaut John Grunsfeld, STS-125 mission specialist, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

STS081-368-018 (12-22 Jan. 1997) --- Astronaut John M. Grunsfeld, STS-81 mission specialist, mans the pilot's station on the Space Shuttle Atlantis' flight deck during rendezvous operations with Russia's Mir Space Station.

JSC2008-E-118401 (26 Sept. 2008) --- Astronaut John Grunsfeld, STS-125 mission specialist, dons a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

S125-E-009828 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, is pictured in the Earth-orbiting Space Shuttle Atlantis? airlock as he prepares for the mission?s fifth and final session of extravehicular activity (EVA).

STS109-E-5720 (8 March 2002) --- Astronaut John M. Grunsfeld, STS-109 payload commander, wearing a portion of the extravehicular mobility unit (EMU) space suit, occupies the commander’s station on the forward flight deck of the Space Shuttle Columbia. The image was recorded with a digital still camera.

S125-E-009788 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, is pictured in the Earth-orbiting Space Shuttle Atlantis? airlock as he prepares for the mission?s fifth and final session of extravehicular activity (EVA).

JSC2008-E-118400 (26 Sept. 2008) --- Astronaut John Grunsfeld (right), STS-125 mission specialist, and Tomas Gonzalez-Torres, STS-125 lead spacewalk officer, discuss training activities in the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Facility near NASA's Johnson Space Center.

S103-E-5201 (21 Dec. 1999) --- Astronaut John M. Grunsfeld, uses a pair of binoculars to view the distant Hubble Space Telescope (HST) several hours prior to its capture by the Space Shuttle Discovery. The photo was taken with an electronic still camera (ESC) at 12:45.19 GMT, Dec. 21, 1999.

S103-E-5202 (21 Dec. 1999) --- Astronaut John M. Grunsfeld, uses a pair of binoculars to view the distant Hubble Space Telescope (HST) several hours prior to its capture by the Space Shuttle Discovery. The photo was taken with an electronic still camera (ESC) at 12:45.30 GMT, Dec. 21, 1999.

S103-E-5206 --- Astronauts Steven L. Smith (right), payload commander, and John M. Grunsfeld use the Canadian-built remote manipulator system (RMS) robot arm to perform servicing tasks on the temporarily-captured Hubble Space Telescope (HST). The photo was taken with an electronic still camera (ESC).

S103-E-5016 (20 December 1999) --- Astronaut John M. Grunsfeld, mission specialist, looks over a flight plan on Space Shuttle Discovery's flight deck while communicating with ground controllers on flight day 1. The photo was taken with an electronic still camera (ESC) at 16:21:29 GMT, December 20, 1999.

STS103-340-036 (19-27 December 1999) --- Wearing Santa hats, astronauts John M. Grunsfeld and Steven L. Smith blend with the season for a brief celebration on the mid deck of the Space Shuttle Discovery. The interruption was very brief as the two mission specialists shortly went about completing their suit-up process in order to participate in STS-103 space walk activity, performing needed work on the Hubble Space Telescope (HST).

Posing for the traditional preflight crew portrait, the seven astronauts of the STS-109 mission are (left to right) astronauts Michael J. Massimino, Richard M. Linnehan, Duane G. Carey, Scott D. Altman, Nancy J. Currie, John M. Grunsfeld and James H. Newman. Altman and Carey were commander and pilot, respectively, with the others serving as mission specialists. Grunsfeld was payload commander. Launched aboard the Space Shuttle Columbia on March 1, 2002, the group was the fourth visit to the the Hubble Space Telescope (HST) for performing upgrade and servicing on the giant orbital observatory.

STS109-E-5449 (4 March 2002) --- Astronaut John M. Grunsfeld, payload commander, peers into the crew cabin of the Space Shuttle Columbia during the first STS-109 extravehicular activity (EVA-1) on March 4, 2002. Grunsfeld's helmet visor, with the sunshield now in place, displays mirrored images of the Earth's hemisphere and the Space Shuttle Columbia's aft cabin. The distorted reflection gives the crew cabin a cyclops-like appearance. Astronauts Grunsfeld and Richard M. Linnehan replaced the starboard solar array on the Hubble Space Telescope (HST) on the first of five scheduled STS-109 space walks. The lower portion of the giant telescope can be seen behind the payload commander. The image was recorded with a digital still camera by a crewmate on shuttle's aft flight deck.

STS109-E-5450 (4 March 2002) --- Astronaut John M. Grunsfeld, payload commander, peers into the crew cabin of the Space Shuttle Columbia during the first STS-109 extravehicular activity (EVA-1) on March 4, 2002. Grunsfeld's helmet visor, with the sunshield now in place, displays mirrored images of the Earth's hemisphere and the Space Shuttle Columbia's aft cabin. The distorted reflection gives the crew cabin a cyclops-like appearance. Astronauts Grunsfeld and Richard M. Linnehan replaced the starboard solar array on the Hubble Space Telescope (HST) on the first of five scheduled STS-109 space walks. The lower portion of the giant telescope can be seen behind the payload commander. The image was recorded with a digital still camera by a crewmate on shuttle's aft flight deck.

Astronaut John Grunsfeld speaks, Wednesday evening, Sept. 9, 2009, during a celebration of the Hubble Legacy at the National Air and Space Museum in Washington. Astronomers declared the Hubble Space Telescope a fully rejuvenated observatory with the release Wednesday of observations from four of its six operating science instruments. Grunsfeld, was a mission specialist aboard STS-125, the mission to repair the Hubble. Photo Credit: (NASA/Bill Ingalls)

S125-E-012353 (19 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, eats a meal on the middeck of the Earth-orbiting Space Shuttle Atlantis.

S125-E-009864 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), and astronaut Andrew Feustel (bottom center), mission specialist, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009890 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), and astronaut Andrew Feustel (foreground), mission specialist, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009944 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), and astronaut Andrew Feustel (top center), mission specialist, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-008007 (16 May 2009) --- Astronauts Andrew Feustel and John Grunsfeld (partially obscured at bottom), both STS-125 mission specialists, participate in the mission?s third session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the six-hour, 36-minute spacewalk, Grunsfeld and Feustel removed the Corrective Optics Space Telescope Axial Replacement and installed in its place the new Cosmic Origins Spectrograph. They also completed the Advanced Camera for Surveys electronic card replacement work, and completed part 2 of the ACS repair, installing a new electronics box and cable.

STS109-E-5249 (4 March 2002) --- In Columbia's cargo bay, astronaut John M. Grunsfeld (foreground), payload commander, signals to a crewmate inside the crew cabin. He had just raised his helmet visor's sun shield. Astronauts Grunsfeld and Richard M. Linnehan (out of frame), mission specialist, participating in the first of their assigned STS-109 space walks to perform work on the Hubble Space Telescope (HST), went on to replace the giant telescope’s starboard solar array. Their seven-hour space walk ended at 7:38 a.m. (CST) or 13:38 GMT March 4, 2002.

STS109-E-5651 (6 March 2002) --- Astronaut John M. Grunsfeld, payload commander, has donned his extravehicular mobility unit (EMU) space suit and appears ready to begin the middle of five scheduled STS-109 space walks to perform work on the Hubble Space Telescope (HST). Astronauts Grunsfeld and Richard M. Linnehan are scheduled for three shared days of extravehicular activity (EVA). The two mission specialists shared an extravehicular activity (EVA) just two days ago, successfully replacing the starboard solar array on the Hubble. This image was recorded with a digital still camera.

S125-E-009918 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), and astronaut Andrew Feustel, mission specialist, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009911 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), and astronaut Andrew Feustel, mission specialist, participate in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.

S125-E-009997 (18 May 2009) --- Astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s fifth and final session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and astronaut Andrew Feustel (out of frame), mission specialist, installed a battery group replacement, removed and replaced a Fine Guidance Sensor and three thermal blankets (NOBL) protecting Hubble?s electronics.