NASA Astronaut Clay Anderson speaks to NASA Twitter followers during the STS-134 Tweetup, Thursday, April 28, 2011, at Kennedy Space Center in Cape Canaveral, Fla. About 150 NASA Twitter followers attended the event. Photo Credit: (NASA/Paul E. Alers)

JSC2009-E-240509 (5 Nov. 2009) --- Astronaut Clayton Anderson, STS-131 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center.

JSC2009-E-240514 (5 Nov. 2009) --- Astronaut Clayton Anderson, STS-131 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center.

JSC2009-E-240471 (5 Nov. 2009) --- An empty Extravehicular Mobility Unit (EMU) spacesuit is photographed prior to a fit check with astronaut Clayton Anderson (out of frame), STS-131 mission specialist, in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center.

JSC2009-E-240528 (5 Nov. 2009) --- Astronaut Clayton Anderson, STS-131 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center. Astronaut Dorothy Metcalf-Lindenburger, mission specialist, assisted Anderson.

JSC2009-E-240510 (5 Nov. 2009) --- Astronaut Clayton Anderson, STS-131 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center. Astronaut Dorothy Metcalf-Lindenburger, mission specialist; along with technicians assisting Anderson, are visible in the reflection in his helmet visor.

JSC2009-E-240473 (5 Nov. 2009) --- Astronaut Clayton Anderson, STS-131 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center. Astronaut Dorothy Metcalf-Lindenburger, mission specialist, assisted Anderson.

Live video from the International Space Station is shown on the screen in the Russian Mission Control Center in Korolev, outside Moscow, Friday, Oct. 12, 2007. Expedition 16 Commander Peggy Whitson, bottom right, Soyuz Commander and Flight Engineer Yuri Malenchenko, bottom center, and Malaysian spaceflight participant Sheikh Muszaphar Shukor docked their Soyuz TMA-11 spacecraft to the station at 10:50 a.m. EDT. October 12. Expedition 15 Commander Fyodor Yurchikhin, top left, and Flight Engineers Oleg Kotov and Clay Anderson, top right, welcomed the new crew aboard the ISS when the hatches were opened at 12:22 p.m. EDT. Both crews will work together for about nine days before Yurchikhin, Kotov and Shukor depart for Earth in their Soyuz TMA-10 spacecraft. Photo Credit: (NASA/Bill Ingalls)

ISS015-E-17670 (5 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, works with a European Modular Cultivation System (EMCS) in the Destiny laboratory of the International Space Station.

ISS015-E-29992 (26 Sept. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, smiles for a photo while using a communication system in the Zvezda Service Module of the International Space Station.

ISS015-E-17654 (4 July 2007) --- NASA astronaut Clay Anderson, Expedition 15 flight engineer, poses for a photo in the Destiny laboratory of the International Space Station.

ISS015-E-29050 (16 Sept. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, uses a communication system in the Destiny laboratory of the International Space Station.

ISS015-E-31308 (27 Sept. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, uses a camera in the Soyuz TMA-10 spacecraft docked to the Zarya module nadir port of the International Space Station.

ISS015-E-36006 (16 Oct. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, smiles for a photo while floating in the Unity node of the International Space Station.

ISS015-E-31714 (3 Oct. 2007) --- NASA astronaut Clay Anderson, Expedition 15 flight engineer, poses with a microbial air sampler (MAS) and petri dish in the Destiny laboratory of the International Space Station.

ISS015-E-19537 (19 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, poses for a photo with two extravehicular mobility units (EMU) in the Quest Airlock of the International Space Station

ISS015-E-20221 (28 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, poses for a photo as he floats in the Destiny laboratory of the International Space Station.

ISS015-E-31717 (3 Oct. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, poses with a microbial air sampler (MAS) and petri dish in the Destiny laboratory of the International Space Station.

ISS015-E-28715 (14 Sept. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, uses a communication system while checking a procedures checklist in the Zvezda Service Module of the International Space Station.

ISS015-E-19264 (24 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, wearing communication headgear, smiles for the camera as he floats in the Zvezda Service Module of the International Space Station.

ISS015-E-18872 (21 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, poses for a photo with food packets floating freely in the Zvezda Service Module of the International Space Station.

ISS015-E-29047 (15 Sept. 2007) --- NASA astronaut Clay Anderson, Expedition 15 flight engineer, smiles for a photo while floating in the Unity node of the International Space Station.

ISS015-E-29049 (16 Sept. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, smiles for a photo while floating in the Destiny laboratory of the International Space Station.

ISS015-E-20239 (28 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, poses for a photo as he floats in the Destiny laboratory of the International Space Station.

ISS015-E-27279 (3 Sept. 2007) --- NASA astronaut Clay Anderson, Expedition 15 flight engineer, poses for a photo near the Earth observation window in the Destiny laboratory of the International Space Station.

ISS015-E-19626 (28 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, poses for a photo as he floats in the Destiny laboratory of the International Space Station.

ISS016-E-009301 (4 Nov. 2007) --- Astronaut Clay Anderson, STS-120 mission specialist, uses a computer in the Destiny laboratory of the International Space Station while Space Shuttle Discovery is docked with the station.

S120-E-006449 (25 Oct. 2007) --- Astronauts Doug Wheelock (left), STS-120 mission specialist, and Clay Anderson, Expedition 16 flight engineer, hold cameras in the hatch of the Quest Airlock of the International Space Station while Space Shuttle Discovery is docked with the station.

JSC2009-E-207371 (11 Sept. 2009) --- NASA astronaut Clay Anderson, STS-131 mission specialist, reads a procedures checklist during a training session in the shuttle mission simulator (SMS) in the Jake Garn Simulation and Training Facility at NASA?s Johnson Space Center.

ISS015-E-32309 (October 2007) --- NASA astronaut Clay Anderson (left) and Russian Federal Space Agency cosmonaut Oleg V. Kotov, both Expedition 15 flight engineers, pose for a photo in the Destiny laboratory of the International Space Station.

JSC2009-E-208025 (14 Sept. 2009) --- NASA astronaut Clay Anderson, STS-131 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

JSC2009-E-208052 (14 Sept. 2009) --- Attired in training versions of their shuttle launch and entry suits, NASA astronauts Clay Anderson (left) and Rick Mastracchio, both STS-131 mission specialists, await the start of a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

JSC2009-E-207880 (15 Sept. 2009) --- Japan Aerospace Exploration Agency (JAXA) astronaut Soichi Noguchi (left), Expedition 22/23 flight engineer; and NASA astronaut Clay Anderson, STS-131 mission specialist, participate in a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

JSC2009-E-208016 (14 Sept. 2009) --- NASA astronaut Clay Anderson, STS-131 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

S118-E-07456 (13 Aug. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, works with the Minus Eighty Degree Laboratory Freezer for ISS (MELFI) in the Destiny laboratory of the International Space Station while Space Shuttle Endeavour (STS-118) remains docked with the station.

ISS015-E-34609 (16 Oct. 2007) --- NASA astronauts Peggy A. Whitson (center), Expedition 16 commander; Clay Anderson (right), flight engineer; and cosmonaut Yuri I. Malenchenko, flight engineer representing Russia's Federal Space Agency, pose for a photo in the Destiny laboratory of the International Space Station.

ISS015-E-18168 (11 July 2007) --- With most of his body tucked away in a sleeping bag, astronaut Clay Anderson, Expedition 15 flight engineer, poses for a photo near two extravehicular mobility unit (EMU) spacesuits in the Quest Airlock of the International Space Station.

ISS015-E-22180 (12 Aug. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, pauses for a photo while using a camera near the aft flight deck of Space Shuttle Endeavour while docked with the International Space Station.

ISS015-E-32200 (6 Oct. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, uses an air sample pump and 2.5 liter gas sample bag to gather and analyze air samples for the Analyzing Interferometer for Ambient Air (ANITA) experiment in the Unity node of the International Space Station.

ISS015-E-27124 (4 Sept. 2007) --- Cosmonaut Fyodor N. Yurchikhin (left), Expedition 15 commander representing Russia's Federal Space Agency, and NASA astronaut Clay Anderson, flight engineer, pose for a photo in the Zvezda Service Module of the International Space Station.

ISS016-E-009700 (4 Nov. 2007) --- Astronaut Clay Anderson, STS-120 mission specialist, prepares to eat a meal at the galley in the Zvezda Service Module of the International Space Station while Space Shuttle Discovery is docked with the station. Astronaut Peggy Whitson, Expedition 16 commander, is at right.

JSC2010-E-017726 (29 Jan. 2010) --- NASA astronaut Clay Anderson, STS-131 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for an ingress/egress training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. United Space Alliance suit technicians Raymond Cuevas and John Hazelhurst assisted Anderson.

JSC2009-E-208970 (17 Sept. 2009) --- United Space Alliance crew trainer Robert (Rob) Tomaro (right) briefs NASA astronaut Clay Anderson, STS-131 mission specialist, in preparation for a water survival training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Anderson is wearing a training version of his shuttle launch and entry suit.

JSC2007-E-098009 (8 Nov. 2007) --- Astronaut Clay Anderson waves to a crowd of well-wishers on hand Nov. 8 at Houston's Ellington Field to greet the returning STS-120 astronauts following the landing of Space Shuttle Discovery in Florida on Nov. 7. Anderson had been flight engineer onboard the International Space Station approximately five months before the undocking of the shuttle and station earlier this week.

JSC2009-E-208860 (17 Sept. 2009) --- United Space Alliance crew trainer Robert (Rob) Tomaro (right) briefs NASA astronaut Clay Anderson, STS-131 mission specialist, in preparation for a water survival training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Anderson is wearing a training version of his shuttle launch and entry suit.

S118-E-07960 (15 Aug. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Anderson and astronaut Rick Mastracchio (out of frame), STS-118 mission specialist, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

JSC2009-E-208913 (17 Sept. 2009) --- NASA astronaut Alan Poindexter (center), STS-131 commander; along with astronauts Rick Mastracchio (left) and Clay Anderson, both mission specialists, take a brief break for a photo during a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Poindexter and Anderson are attired in training versions of their shuttle launch and entry suits.

ISS015-E-19179 (23 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, enters the Quest Airlock on the International Space Station at the conclusion of today's session of extravehicular activity (EVA). During the 7-hour 41-minute spacewalk, Anderson and cosmonaut Fyodor N. Yurchikhin (out of frame), commander representing Russia's Federal Space Agency, installed a television camera stanchion, reconfigured a power supply for an antenna assembly, and performed several get-ahead tasks. Also, while riding on the end of the Canadarm2, Anderson jettisoned the Early Ammonia Servicer (EAS) by shoving it opposite of the station's direction of travel.

ISS015-E-19114 (23 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, waves to the camera while participating in a session of extravehicular activity (EVA) as construction continues on the International Space Station. During the 7-hour 41-minute spacewalk, Anderson and cosmonaut Fyodor N. Yurchikhin (out of frame), commander representing Russia's Federal Space Agency, installed a television camera stanchion, reconfigured a power supply for an antenna assembly, and performed several get-ahead tasks. Also, while riding on the end of the Canadarm2, Anderson jettisoned the Early Ammonia Servicer (EAS) by shoving it opposite of the station's direction of travel.

ISS015-E-19120 (23 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, waves to the camera while participating in a session of extravehicular activity (EVA) as construction continues on the International Space Station. During the 7-hour 41-minute spacewalk, Anderson and cosmonaut Fyodor N. Yurchikhin (out of frame), commander representing Russia's Federal Space Agency, installed a television camera stanchion, reconfigured a power supply for an antenna assembly, and performed several get-ahead tasks. Also, while riding on the end of the Canadarm2, Anderson jettisoned the Early Ammonia Servicer (EAS) by shoving it opposite of the station's direction of travel.

ISS015-E-18958 (23 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, waves to the camera while participating in a session of extravehicular activity (EVA) as construction continues on the International Space Station. During the 7-hour 41-minute spacewalk, Anderson and cosmonaut Fyodor N. Yurchikhin (out of frame), commander representing Russia's Federal Space Agency, installed a television camera stanchion, reconfigured a power supply for an antenna assembly, and performed several get-ahead tasks. Also, while riding on the end of the Canadarm2, Anderson jettisoned the Early Ammonia Servicer (EAS) by shoving it opposite of the station's direction of travel. The station's robotic arm end effector is at left.

ISS015-E-19165 (23 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, enters the Quest Airlock on the International Space Station at the conclusion of today's session of extravehicular activity (EVA). During the 7-hour 41-minute spacewalk, Anderson and cosmonaut Fyodor N. Yurchikhin (out of frame), commander representing Russia's Federal Space Agency, installed a television camera stanchion, reconfigured a power supply for an antenna assembly, and performed several get-ahead tasks. Also, while riding on the end of the Canadarm2, Anderson jettisoned the Early Ammonia Servicer (EAS) by shoving it opposite of the station's direction of travel.

S118-E-07970 (15 Aug. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Anderson and astronaut Rick Mastracchio (out of frame), STS-118 mission specialist, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder. The blackness of space and Earth's horizon provide the backdrop for the scene.

S118-E-08022 (15 Aug. 2007) --- Astronauts Clay Anderson (left), Expedition 15 flight engineer; and Rick Mastracchio, STS-118 mission specialist, participate in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and Anderson relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder. The blackness of space and Earth's horizon provide the backdrop for the scene.

S118-E-07966 (15 Aug. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Anderson and astronaut Rick Mastracchio (out of frame), STS-118 mission specialist, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder. The blackness of space and Earth's horizon provide the backdrop for the scene.

ISS015-E-22561 (15 Aug. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, uses a digital camera to expose a photo of his helmet visor during the mission's third planned session of extravehicular activity (EVA) as construction continues on the International Space Station. Also visible in the reflections in the visor are various components of the station and a blue and white portion of Earth. During the 5-hour, 28-minute spacewalk, Anderson and astronaut Rick Mastracchio (out of frame), STS-118 mission specialist, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

ISS015-E-19135 (23 July 2007) --- Anchored to the Canadarm2 foot restraint, astronaut Clay Anderson, Expedition 15 flight engineer, removes the Early Ammonia Servicer (EAS) from its place on the International Space Station during a session of extravehicular activity (EVA). Anderson later jettisoned the EAS by shoving it opposite of the station's direction of travel. The EAS was installed on the P6 truss during STS-105 in August 2001, as an ammonia reservoir if a leak had occurred. It was never used, and was no longer needed after the permanent cooling system was activated last December. The blackness of space and Earth's horizon provide the backdrop for the scene.

ISS016-S-002C (June 2007) --- This crew portrait shows astronaut Peggy Whitson, expedition 16 commander, with Russia's Federal Space Agency cosmonaut Yuri Malenchenko (right), flight engineer and Soyuz commander; and astronaut Dan Tani, flight engineer, who will arrive on the station in October to replace Clay Anderson. Anderson will have been aboard since June. Whitson and Malenchenko, two veterans of previous International Space Station flights, are scheduled to launch to the complex in the Soyuz TMA-11 spacecraft from the Baikonur Cosmodrome in Kazakhstan in October for a six-month mission.

S118-E-08028 (15 Aug. 2007) --- Astronauts Clay Anderson (left), Expedition 15 flight engineer; and Rick Mastracchio, STS-118 mission specialist, participate in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and Anderson relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder. The blackness of space and Earth's horizon provide the backdrop for the scene.

S118-E-09144 (18 Aug. 2007) --- Astronauts Clay Anderson, Expedition 15 flight engineer, and Dave Williams (out of frame), STS-118 mission specialist representing the Canadian Space Agency, participate in the mission's fourth and final session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour spacewalk, Anderson and Williams installed the External Wireless Instrumentation System antenna, attached a stand for the shuttle's robotic arm extension boom and retrieved the two Materials International Space Station Experiments (MISSE) to be brought back on the shuttle.

S118-E-07326 (15 Aug. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Anderson and astronaut Rick Mastracchio (out of frame), STS-118 mission specialist, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder. The blackness of space and Earth's horizon provide the backdrop for the scene.

S118-E-08015 (15 Aug. 2007) --- Astronauts Rick Mastracchio (right), STS-118 mission specialist; and Clay Anderson (anchored to the foot restraint on the Canadarm2), Expedition 15 flight engineer, participate in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and Anderson relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

ISS015-E-19140 (23 July 2007) --- Anchored to the Canadarm2 foot restraint, astronaut Clay Anderson, Expedition 15 flight engineer, removes the Early Ammonia Servicer (EAS) from its place on the International Space Station during a session of extravehicular activity (EVA). Anderson later jettisoned the EAS by shoving it opposite of the station's direction of travel. The EAS was installed on the P6 truss during STS-105 in August 2001, as an ammonia reservoir if a leak had occurred. It was never used, and was no longer needed after the permanent cooling system was activated last December. The blackness of space and Earth's horizon provide the backdrop for the scene.

S118-E-07998 (15 Aug. 2007) --- Astronauts Rick Mastracchio (right), STS-118 mission specialist; and Clay Anderson, Expedition 15 flight engineer, participate in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and Anderson relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder. The blackness of space and Earth's horizon provide the backdrop for the scene.

S118-E-07335 (15 Aug. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Anderson and astronaut Rick Mastracchio (out of frame), STS-118 mission specialist, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder. The blackness of space and Earth's horizon provide the backdrop for the scene.

ISS016-S-002B (June 2007) --- This crew portrait shows astronaut Peggy Whitson, Expedition 16 commander, with Russia Federal Space Agency's cosmonaut Yuri Malenchenko (right), flight engineer and Soyuz commander; and astronaut Clay Anderson, flight engineer, who arrived on the station in June. Whitson and Malenchenko, two veterans of previous International Space Station flights, are scheduled to launch to the complex in the Soyuz TMA-11 spacecraft from the Baikonur Cosmodrome in Kazakhstan in October for a six-month mission. Anderson will be replaced in October by astronaut Dan Tani of NASA.

S118-E-08009 (15 Aug. 2007) --- Astronauts Rick Mastracchio (left), STS-118 mission specialist; and Clay Anderson, Expedition 15 flight engineer, participate in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and Anderson relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder. The blackness of space and Earth's horizon provide the backdrop for the scene.

S118-E-07997 (15 Aug. 2007) --- Astronauts Rick Mastracchio (right), STS-118 mission specialist; and Clay Anderson, Expedition 15 flight engineer, participate in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and Anderson relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder. The blackness of space and Earth's horizon provide the backdrop for the scene.

ISS015-E-18961 (23 July 2007) --- Cosmonaut Fyodor N. Yurchikhin, Expedition 15 commander representing Russia's Federal Space Agency, participates in a session of extravehicular activity (EVA) as construction continues on the International Space Station. During the 7-hour 41-minute spacewalk, Yurchikhin and astronaut Clay Anderson (out of frame), flight engineer, removed and jettisoned the Early Ammonia Servicer (EAS), installed a television camera stanchion, reconfigured a power supply for an antenna assembly, and performed several get-ahead tasks.

JSC2009-E-207891 (15 Sept. 2009) --- Japan Aerospace Exploration Agency (JAXA) astronaut Soichi Noguchi (center), Expedition 22/23 flight engineer; NASA astronauts Clay Anderson (background) and Dorothy Metcalf-Lindenburger, both STS-131 mission specialists; along with Russian cosmonaut Oleg Kotov (right), Expedition 22 flight engineer and Expedition 23 commander, participate in a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

ISS015-E-22632 (15 Aug. 2007) --- Astronaut Rick Mastracchio, STS-118 mission specialist, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and astronaut Clay Anderson (out of frame), Expedition 15 flight engineer, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

ISS015-E-19036 (23 July 2007) --- The shadow of astronaut Clay Anderson, Expedition 15 flight engineer, who is anchored to the Canadarm2 foot restraint, is visible against solar array panels of a Soyuz spacecraft docked to the International Space Station during a session of extravehicular activity (EVA). This image was captured following the jettisoning of an Early Ammonia Servicer (EAS).

S118-E-09265 (18 Aug. 2007) --- Astronauts Barbara R. Morgan (left) and Tracy Caldwell, both STS-118 mission specialists, pose with a photo of astronauts Clay Anderson and Sunita Williams, both Expedition 15 flight engineers, near a hatch on the International Space Station while Space Shuttle Endeavour remains docked with the station.

S120-E-008849 (4 Nov. 2007) --- Astronauts Peggy Whitson, Expedition 16 commander, and Clay Anderson, STS-120 mission specialist, exchange hugs during a farewell ceremony in the Destiny laboratory of the International Space Station (ISS). Also pictured are astronauts Doug Wheelock (right foreground), STS-120 mission specialist; George Zamka (partially obscured), pilot; and Daniel Tani, ISS flight engineer. Hatches were closed between the station and Space Shuttle Discovery at 2:03 p.m. (CST) on Nov. 4.

ISS015-E-19123 (23 July 2007) --- Cosmonaut Fyodor N. Yurchikhin, Expedition 15 commander representing Russia's Federal Space Agency, participates in a session of extravehicular activity (EVA) as construction continues on the International Space Station. During the 7-hour 41-minute spacewalk, Yurchikhin and astronaut Clay Anderson (out of frame), flight engineer, removed and jettisoned the Early Ammonia Servicer (EAS), installed a television camera stanchion, reconfigured a power supply for an antenna assembly, and performed several get-ahead tasks.

JSC2007-E-098002 (8 Nov. 2007) --- The crew of the STS-120 mission was welcomed home to Houston Nov. 8, following the landing of Space Shuttle Discovery in Florida on Nov. 7. Center Director Mike Coats, far right, introduced the crew to the crowd on hand at Ellington Field. From the right are STS-120 commander Pam Melroy, pilot George Zamka and mission specialists Scott Parazynski, Stephanie Wilson, Doug Wheelock, Paolo Nespoli (ESA) and Clay Anderson were welcomed by family and friends during the ceremony.

JSC2009-E-207357 (11 Sept. 2009) --- NASA astronauts Alan Poindexter (right), STS-131 commander; Dorothy Metcalf-Lindenburger and Clay Anderson (mostly out of frame at left), both mission specialists; along with James P. Dutton Jr., pilot, participate in a training session in the shuttle mission simulator (SMS) in the Jake Garn Simulation and Training Facility at NASA?s Johnson Space Center.

ISS015-E-22529 (15 Aug. 2007) --- Astronaut Rick Mastracchio, STS-118 mission specialist, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and astronaut Clay Anderson (out of frame), Expedition 15 flight engineer, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

S118-E-06097 (10 Aug. 2007) --- Barbara R. Morgan, STS-118 mission specialist, participates in what looks like a photographers' convention in the Destiny lab onboard the International Space Station. Her two "fellow delegates" are astronaut Alvin Drew (center), STS-118 mission specialist, and astronaut Clay Anderson, Expedition 15 flight engineer. The photo was taken not long after the hatches were open on the orbital outpost, an action that allowed the station's population to surge from three to ten in short order.

S118-E-09248 (18 Aug. 2007) --- Cosmonaut Oleg V. Kotov, Expedition 15 flight engineer representing Russia's Federal Space Agency, prepares to eat a meal at the galley during a farewell ceremony for the STS-118 crewmembers in the Zvezda Service Module of the International Space Station. Astronaut Clay Anderson, flight engineer, is visible in the background. Hatches were closed between the station and Space Shuttle Endeavour at 4:10 p.m. on Aug. 18.

JSC2009-E-207999 (14 Sept. 2009) --- NASA astronauts Rick Mastracchio (left) and Clay Anderson; along with Japan Aerospace Exploration Agency (JAXA) astronaut Naoko Yamazaki, all STS-131 mission specialists, participate in a training session near one of the full-scale trainers in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

ISS015-E-22634 (15 Aug. 2007) --- Astronaut Rick Mastracchio, STS-118 mission specialist, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and astronaut Clay Anderson (out of frame), Expedition 15 flight engineer, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

ISS015-E-18967 (23 July 2007) --- An Early Ammonia Servicer (EAS) moves away from the International Space Station after it was jettisoned by astronaut Clay Anderson (out of frame), Expedition 15 flight engineer, during today's session of extravehicular activity (EVA). The EAS was installed on the P6 truss during STS-105 in August 2001, as an ammonia reservoir if a leak had occurred. It was never used, and was no longer needed after the permanent cooling system was activated last December.

S118-E-07383 (15 Aug. 2007) --- Astronaut Rick Mastracchio, STS-118 mission specialist, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and astronaut Clay Anderson (out of frame), Expedition 15 flight engineer, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

JSC2007-E-098003 (8 Nov. 2007) --- The crew of the STS-120 mission was welcomed home to Houston Nov. 8, following the landing of Space Shuttle Discovery in Florida on Nov. 7. STS-120 commander Pam Melroy, pilot George Zamka (both pictured here with JSC Director Mike Coats) along with mission specialists Scott Parazynski, Stephanie Wilson, Doug Wheelock, Paolo Nespoli (ESA) and Clay Anderson (all out of frame) were welcomed by family and friends during a ceremony at Houston's Ellington Field.

JSC2009-E-207887 (15 Sept. 2009) --- NASA astronauts James P. Dutton Jr. (left), STS-131 pilot; Rick Mastracchio and Clay Anderson, both mission specialists; along with Russian cosmonaut Oleg Kotov, Expedition 22 flight engineer and Expedition 23 commander, participate in a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

JSC2007-E-098007 (8 Nov. 2007) --- The crew of the STS-120 mission was welcomed home to Houston Nov. 8, following the landing of Space Shuttle Discovery in Florida on Nov. 7. Astronaut Doug Wheelock, mission specialist, addresses the crowd on hand at Ellington Field. Also seen are astronauts Stephanie Wilson and Scott Parazynski, mission specialists. Not pictured are STS-120 commander Pam Melroy, pilot George Zamka and mission specialists Paolo Nespoli (ESA) and Clay Anderson.

ISS015-E-22539 (15 Aug. 2007) --- Astronaut Rick Mastracchio, STS-118 mission specialist, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and astronaut Clay Anderson (out of frame), Expedition 15 flight engineer, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

ISS015-E-18239 (14 July 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, prepares the Capillary Flow Experiment (CFE) Vane Gap-1 for video documentation. The CFE is positioned on the Maintenance Work Area in the Destiny laboratory of the International Space Station. CFE observes the flow of fluid, in particular capillary phenomena, in microgravity.

S118-E-07382 (15 Aug. 2007) --- Astronaut Rick Mastracchio, STS-118 mission specialist, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and astronaut Clay Anderson (out of frame), Expedition 15 flight engineer, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

JSC2007-E-098004 (8 Nov. 2007) --- The crew of the STS-120 mission was welcomed home to Houston Nov. 8, following the landing of Space Shuttle Discovery in Florida on Nov. 7. STS-120 commander Pam Melroy, and pilot George Zamka (both pictured) along with mission specialists Scott Parazynski, Stephanie Wilson, Doug Wheelock, Paolo Nespoli (ESA) and Clay Anderson (all out of frame) were welcomed by family and friends during a ceremony at Houston's Ellington Field.

JSC2007-E-098008 (8 Nov. 2007) --- European Space Agency astronaut Paolo Nespoli, STS-120 mission specialist, waves his homeland's national flag during the Discovery crew's Nov. 8 welcome home ceremony at Houston's Ellington Field. Other replicas of the Italian flag were seen waving throughout the hangar. Nespoli is flanked by two fellow mission specialists -- astronauts Clay Anderson (left) and Doug Wheelock.

ISS015-E-22527 (15 Aug. 2007) --- Astronaut Rick Mastracchio, STS-118 mission specialist, participates in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and astronaut Clay Anderson (out of frame), Expedition 15 flight engineer, relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

JSC2007-E-098010 (8 Nov. 2007) --- "Look, I'm seeing double," European Space Agency astronaut Paolo Nespoli appears to be saying as he points toward a life size photo cutout (out of frame) of astronaut Clay Anderson, seated to his right, during the Discovery crew's Nov. 8 welcome home ceremony at Houston's Ellington Field. The two mission specialists were joined by their five STS-120 crewmates on the stage of Ellington's hangars.

JSC2007-E-15872 (22 March 2007) --- Canadian Space Agency astronaut Dafydd R. (Dave) Williams, STS-118 mission specialist, receives assistance in donning a training version of his shuttle launch and entry suit in preparation for a training session in the Full Fuselage Trainer (FFT) mockup (out of frame) in the Space Vehicle Mockup Facility at the Johnson Space Center.

JSC2005-E-31315 (28 July 2005) --- Astronaut Clayton C. Anderson, Expedition 14 backup flight engineer, floats in a small life raft during an emergency bailout training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center. Anderson is wearing a training version of the shuttle launch and entry suit.

ISS016-S-002F (June 2007) --- This crew portrait shows the variety of crewmembers who will occupy the International Space Station during Expedition 16. Astronaut Peggy Whitson (front row, right), station commander; and Russia's Federal Space Agency cosmonaut Yuri Malenchenko (front row, left), flight engineer and Soyuz commander, will join NASA astronaut Clay Anderson (back row, left), flight engineer, in October after launching from the Baikonur Cosmodrome in Kazakhstan on the Soyuz TMA-11 spacecraft. Anderson will be replaced in October by astronaut Dan Tani (back row, second from left), flight engineer, who will yield his place in December to Leopold Eyharts of the European Space Agency (back row, third from left). Eyharts will be replaced in February 2008 by astronaut Garrett Reisman (back row, far right), flight engineer.

ISS015-E-25420 (30 Aug. 2007) --- Astronaut Clay Anderson (left), Expedition 15 flight engineer, works the controls of the station's robotic arm, Canadarm2; while cosmonaut Fyodor N. Yurchikhin, commander representing Russia's Federal Space Agency, works with docking systems in the Destiny laboratory of the International Space Station during Pressurized Mating Adapter-3 (PMA-3) transfer operations. Using the Canadarm2, the PMA-3 was undocked from the Unity node's left side at 7:18 a.m. (CDT) and docked to Unity's lower port at 8:07 a.m. to prepare for the arrival of Node 2, the Harmony module, on the STS-120 flight of Space Shuttle Discovery in October 2007.

ISS015-E-26252 (1 Sept. 2007) --- Astronaut Clay Anderson, Expedition 15 flight engineer, works on the Smoke and Aerosol Measurement Experiment (SAME) hardware setup located in the Microgravity Science Glovebox (MSG) in the Destiny laboratory of the International Space Station. SAME will measure the smoke properties, or particle size distribution, of typical particles that are produced from different materials that can be found onboard station and other spacecrafts. SAME aims to test the performance of ionization smoke detectors and evaluate the performance of the photoelectric smoke detectors. The data will be used to develop a model that can predict smoke droplet growth that will be used to evaluate future smoke detection devices.

S118-E-09157 (18 Aug. 2007) --- Astronaut Dave Williams, STS-118 mission specialist representing the Canadian Space Agency, participates in the mission's fourth and final session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour spacewalk, Williams and astronaut Clay Anderson (out of frame), Expedition 15 flight engineer, installed the External Wireless Instrumentation System antenna, attached a stand for the shuttle's robotic arm extension boom and retrieved the two Materials International Space Station Experiments (MISSE) to be brought back on the shuttle.