jsc2024e066574 (Oct. 28, 2024) --- NASA astronaut and Soyuz MS-27 crew member Jonny Kim undergoes International Space Station Extravehicular Activity (EVA) maintenance training, or spacewalk training, at Jonson’s Neutral Buoyancy Laboratory.

jsc2024e066564 (Oct. 8, 2024) --- NASA astronaut and Soyuz MS-27 crew member Jonny Kim undergoes International Space Station Extravehicular Activity (EVA) maintenance training, or spacewalk training, at Jonson’s Neutral Buoyancy Laboratory.

jsc2024e066553 (Oct. 8, 2024) --- NASA astronaut Jonny Kim and Soyuz MS-27 crew member Jonny Kim undergoes International Space Station Extravehicular Activity (EVA) maintenance training, or spacewalk training, at Jonson’s Neutral Buoyancy Laboratory.

jsc2024e066561 (Oct. 8, 2024) --- NASA astronaut Jonny Kim and Soyuz MS-27 crew member Jonny Kim undergoes International Space Station Extravehicular Activity (EVA) maintenance training, or spacewalk training, at Jonson’s Neutral Buoyancy Laboratory.

STS061-95-028 (6 Dec 1993) --- Astronaut Kathryn C. Thornton, on the end of the Space Shuttle Endeavour's Remote Manipulator System (RMS) arm, hovers over equipment associated with servicing chores on the Hubble Space Telescope (HST) during the second extravehicular activity (EVA) on the eleven-day mission. Astronauts Thornton and Thomas D. Akers changed out the solar array panels during this EVA.

View of FGB solar array panels taken during Russian extravehicular activity (EVA) 36 in support of assembly and maintenance on the International Space Station.

STS061-098-000K (8 Dec. 1993) --- Astronaut Kathryn C. Thornton works with equipment associated with servicing chores on the Hubble Space Telescope (HST) during the fourth extravehicular activity (EVA) on the eleven-day mission.

STS061-47-014 (8 Dec 1993) --- Astronaut Kathryn C. Thornton lifts the Corrective Optics Space Telescope Axial Replacement (COSTAR) prior to its installation on the Hubble Space Telescope (HST). Thornton is anchored to a foot restraint on the end of the Remote Manipulator System (RMS) arm. Astronaut Thomas D. Akers, who assisted in the COSTAR installation, is at lower left.

STS061-37-011 (7 Dec 1993) --- Astronaut Jeffrey A. Hoffman with Wide Field/Planetary Camera (WF/PC 1) during changeout operations. WF/PC-2 has already been installed in cavity (out of frame). Astronauts Hoffman and Story Musgrave are performing Extravehicular Activities (EVA) to repair the Hubble Space Telescope (HST).

STS061-65-009 (2-13 Dec 1993) --- Astronaut Jeffrey A. Hoffman is reflected in the helmet visor of F. Story Musgrave as he photographs the veteran astronaut during one of the pair's three-shared extravehicular activity?s (EVA).

ISS020-E-038038 (3 Sept. 2009) --- A portion of the International Space Station is featured in this image photographed by a space walking astronaut during the STS-128 mission?s second session of extravehicular activity (EVA) as construction and maintenance continue on the station. The blackness of space and Earth?s horizon provide the backdrop for the scene.

ISS020-E-038055 (3 Sept. 2009) --- A portion of the International Space Station is featured in this image photographed by a space walking astronaut during the STS-128 mission?s second session of extravehicular activity (EVA) as construction and maintenance continue on the station. The blackness of space and Earth?s horizon provide the backdrop for the scene.

ISS020-E-038488 (5 Sept. 2009) --- A portion of the International Space Station is featured in this image photographed by a space walking astronaut during the STS-128 mission?s third and final session of extravehicular activity (EVA) as construction and maintenance continue on the station. The blackness of space and Earth?s horizon provide the backdrop for the scene.

ISS020-E-038012 (3 Sept. 2009) --- A portion of the International Space Station is featured in this image photographed by a space walking astronaut during the STS-128 mission?s second session of extravehicular activity (EVA) as construction and maintenance continue on the station. The blackness of space and the thin line of Earth?s atmosphere provide the backdrop for the scene.

ISS023-E-021543 (11 April 2010) --- The nose and forward cabin of the docked space shuttle Discovery is featured in this image photographed by a spacewalker during the STS-131 mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station.

S118-E-07484 (13 Aug. 2007) --- Astronaut Rick Mastracchio, STS-118 mission specialist, prepares to exit the Quest Airlock of the International Space Station for the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the station.

ISS028-E-005584 (25 May 2011) --- NASA astronaut Michael Fincke, STS-134 mission specialist, uses a digital still camera during the STS-134 mission’s third session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station.

ISS043E087403 (04/06/2015) --- NASA astronauts Terry Virts (left) and Scott Kelly are seen here inside the station’s Quest airlock. The pair were performing routine maintenance activities on two of the International Space Station’s Extravehicular Mobility Units (EMU,) or spacesuits, seen in the background.

ISS040E099355 (08/18/2014) --- Russian cosmonaut Alexander Skvortsov (red stripes), Expedition 40 flight engineer, attired in a Russian Orlan spacesuit outside the International Space Station, participates in a session of extravehicular activity (EVA) number 39 in support of science and maintenance. The Solar array is visible in the background.

STS061-77-094 (7 Dec 1993) --- Astronaut Jeffrey A. Hoffman, anchored to the end of the Remote Manipulator System (RMS) arm, prepares to stow the Wide Field\Planetary Camera (WF\PC I) for the Hubble Space Telescope (HST), during their extravehicular activity (EVA). Astronaut F. Story Musgrave, stationed at the stowage area at bottom of frame, assists. WF/PC II is in place on the HST.

STS061-77-078 (7 Dec 1993) --- Astronaut Jeffrey A. Hoffman, anchored on the end of the Remote Manipulator System (RMS) arm, is pictured with the Wide Field/Planetary Camera (WF/PC I) during the third of five extravehicular activity?s (EVA). Astronauts Hoffman and F. Story Musgrave, seen near the stowage area for the WF/PC, had earlier installed the new camera (note white rectangle) on lower portion of telescope.

STS061-48-027 (9 Dec 1993) --- Astronaut F. Story Musgrave moves about in the Space Shuttle Endeavour's cargo bay during the deployment of the solar array panels on the Hubble Space Telescope (HST) during the final of five STS-61 space walks. The left hand of astronaut Jeffrey A. Hoffman appears at lower left corner.

STS061-58-033 (7 Dec 1993) --- Anchored to the Space Shuttle Endeavour's Remote Manipulator System (RMS) arm, astronaut Jeffrey A. Hoffman works with the replacement Wide Field/Planetary Camera (WF/PC II) for the Hubble Space Telescope (HST) during the third of five space walks. Astronaut F. Story Musgrave, who joined Hoffman for three of the five space walks, helps with alignment at center frame.

STS61-S-093 (5 Dec 1993) --- Flight controller Kevin McCluney monitors the televised activity of astronauts F. Story Musgrave and Jeffrey A. Hoffman. The veteran astronauts were performing the first extravehicular activity (EVA-1) of the STS-61 Hubble Space Telescope (HST) servicing mission. McCluney's duties deal with maintenance, mechanical, arm and crew systems, meaning that he and his colleagues will be exceptionally busy for the next five days. Four astronauts in alternating pairs will perform a variety of tasks on the giant telescope during that period.

STS061-105-026 (7 Dec. 1993) --- Astronaut Jeffrey A. Hoffman signals directions to European Space Agency (ESA) astronaut Claude Nicollier, as the latter controls the Remote Manipulator System (RMS) arm during the third of five Extravehicular Activities (EVA) on the Hubble Space Telescope (HST) servicing mission. Astronauts Hoffman and F. Story Musgrave earlier changed out the Wide Field\Planetary Camera (WF\PC).

STS061-98-0AR (8 Dec 1993) --- Earth is partially illuminated but the Hubble Space Telescope (HST) and the Space Shuttle Endeavour are still mostly in darkness, in this 70mm frame photographed during the fourth of five space walks. Astronaut Kathryn C. Thornton, barely visible above left center in the frame, works to install the Corrective Optics Space Telescope Axial Replacement (COSTAR).

STS061-104-007 (5 Dec 1993) --- Astronaut F. Story Musgrave, holding to one of many strategically placed handrails on the Hubble Space Telescope (HST), is photographed during the first of five extravehicular activity?s (EVA) on the HST-servicing mission, aboard the Space Shuttle Endeavour.

STS061-86-048 (5 Dec 1993) --- Astronauts F. Story Musgrave (foreground) and Jeffrey A. Hoffman are pictured near the end of the first of five extravehicular activity?s (EVA). Musgrave works at the Solar Array Carrier (SAC) in the Space Shuttle Endeavour's cargo bay. Hoffman, anchored to a foot restraint mounted on the end of the Space Shuttle Endeavour's Remote Manipulator System (RMS) arm, waits to be maneuvered to the forward payload bay. The original solar array panels are partially visible at top, while their replacements remain stowed in foreground. The crew's second pair of space walkers -- astronauts Kathryn C. Thornton and Thomas D. Akers -- later changed the solar arrays on the mission's second EVA.

STS061-94-059 (8 Dec. 1993) --- Astronaut Thomas D. Akers maneuvers inside the bay which will house the Corrective Optics Space Telescope Axial Replacement (COSTAR) while assisting astronaut Kathryn C. Thornton with the installation of the 640-pound instrument. Thornton, anchored on the end of the Remote Manipulator System (RMS) arm, is partially visible as she prepares to install the COSTAR.

STS061-102-010 (9 Dec 1993) --- Astronauts Jeffrey A. Hoffman (left) and F. Story Musgrave team to replace one of two Solar Array Drive Electronics (SADE) units on the Hubble Space Telescope (HST). Musgrave is standing on a foot restraint mounted on the end of the Space Shuttle Endeavour's Remote Manipulator System (RMS) arm. The black object, in upper left corner, is part of the window frame, through which this 70mm frame was exposed, inside Endeavour's cabin.

STS061-95-075 (6 Dec 1993) --- Astronauts Kathryn C. Thornton and Thomas D. Akers work to remove one of the solar arrays on the Hubble Space Telescope (HST) on the second of five extravehicular activity?s (EVA). The two space walkers later replaced both solar array panels. Part of Australia is in the background.

STS061-87-046 (5 Dec 1993) --- Astronauts Jeffrey A. Hoffman (right) and F. Story Musgrave work near the base of the Hubble Space Telescope (HST) on the first of five spacewalks. Their particular mission here is to replace failed Rate Sensor Units (RSU) inside the telescope's housing. Hoffman is anchored to a foot restraint, mounted on the end of the Space Shuttle Endeavour's Remote Manipulator System (RMS) arm, while Musgrave is standing on a foot restraint attached to a support structure in the cargo bay.

STS069-714-042 (16 September 1995) --- Astronauts James S. Voss, (red stripe on space suit) and Michael L. Gernhardt work together at the Extravehicular Activity (EVA) Assembly and Maintenance Task Board in the Space Shuttle Endeavour’s cargo bay. The EVA task board, with an approximate volume of 64 inches by 69 inches 27 inches and an Earth-bound weight of 450 pounds, helped the two space walkers evaluate work that will be done in the relatively near future on the International Space Station (ISS).

S128-E-007690 (3 Sept. 2009) --- NASA astronaut John “Danny” Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery’s cargo bay.

ISS020-E-038099 (3 Sept. 2009) --- NASA astronaut John ?Danny? Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery?s cargo bay.

ISS020-E-038083 (3 Sept. 2009) --- NASA astronaut John ?Danny? Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery?s cargo bay.

S128-E-007695 (3 Sept. 2009) --- NASA astronaut John “Danny” Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery’s cargo bay.

ISS020-E-038110 (3 Sept. 2009) --- NASA astronaut John ?Danny? Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery?s cargo bay.

ISS020-E-038126 (3 Sept. 2009) --- NASA astronaut John ?Danny? Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery?s cargo bay.

S122-E-008153 (13 Feb. 2008) --- In the darkness of space, European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S128-E-007693 (3 Sept. 2009) --- NASA astronaut John “Danny” Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery’s cargo bay.

ISS020-E-038152 (3 Sept. 2009) --- NASA astronaut John ?Danny? Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery?s cargo bay.

S128-E-007689 (3 Sept. 2009) --- NASA astronaut John “Danny” Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery’s cargo bay.

ISS020-E-038140 (3 Sept. 2009) --- NASA astronaut John ?Danny? Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery?s cargo bay.

S128-E-007696 (3 Sept. 2009) --- European Space Agency astronaut Christer Fuglesang, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Fuglesang and NASA astronaut John “Danny” Olivas (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery’s cargo bay.

S128-E-007486 (3 Sept. 2009) --- European Space Agency astronaut Christer Fuglesang, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Fuglesang and NASA astronaut John “Danny” Olivas (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery’s cargo bay.

ISS020-E-038122 (3 Sept. 2009) --- NASA astronaut John ?Danny? Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery?s cargo bay.

S122-E-008221 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, works on the new Columbus laboratory as he participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008325 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008317 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008312 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008200 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel (top) and NASA astronaut Rex Walheim, both STS-122 mission specialists, participate in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Walheim and Schlegel worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

ISS011-E-11958 (18 August 2005) --- Attired in a Russian Orlan spacesuit, astronaut John L. Phillips, Expedition 11 NASA Space Station science officer and flight engineer, participates in a session of extravehicular activity (EVA). The 4 hour 58 minute spacewalk by Phillips and cosmonaut Sergei K. Krikalev (out of frame), commander representing Russia's Federal Space Agency, was the 62nd EVA in support of Station assembly and maintenance, the 34th conducted from the Station itself, and the 16th from the Pirs Docking Compartment.

S122-E-008401 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008219 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008323 (13 Feb. 2008) --- Astronaut Rex Walheim, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Walheim and European Space Agency (ESA) astronaut Hans Schlegel (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008327 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008357 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008195 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008187 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel (left) and NASA astronaut Rex Walheim, both STS-122 mission specialists, participate in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Walheim and Schlegel worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

ISS017-E-011287 (15 July 2008) --- Russian Federal Space Agency cosmonaut Sergei Volkov (bottom center), Expedition 17 commander, participates in a session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 54-minute spacewalk, Volkov and cosmonaut Oleg Kononenko (out of frame), flight engineer, continued to outfit the station's exterior, including the installation of a docking target on the Zvezda Service Module.

S122-E-008315 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

ISS037-E-028787 (9 Nov. 2013) --- Russian cosmonauts Oleg Kotov (left) and Sergey Ryazanskiy, both Expedition 37 flight engineers, attired in Russian Orlan spacesuits, participate in a session of extravehicular activity (EVA) in support of assembly and maintenance on the International Space Station. During the five-hour, 50-minute spacewalk, Kotov and Ryazanskiy continued the setup of a combination EVA workstation and biaxial pointing platform that was installed during an Expedition 36 spacewalk on Aug. 22. Earth’s horizon and the blackness of space provide the backdrop for the scene.

S122-E-008218 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008199 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel (right) and NASA astronaut Rex Walheim, both STS-122 mission specialists, participate in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Walheim and Schlegel worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

ISS017-E-011315 (15 July 2008) --- Russian Federal Space Agency cosmonaut Sergei Volkov, Expedition 17 commander, participates in a session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 54-minute spacewalk, Volkov and cosmonaut Oleg Kononenko (out of frame), flight engineer, continued to outfit the station's exterior, including the installation of a docking target on the Zvezda Service Module.

S122-E-008395 (13 Feb. 2008) --- Astronaut Rex Walheim, STS-122 mission specialist, participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Walheim and European Space Agency (ESA) astronaut Hans Schlegel (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

S122-E-008222 (13 Feb. 2008) --- European Space Agency (ESA) astronaut Hans Schlegel, STS-122 mission specialist, works on the new Columbus laboratory as he participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station's ammonia cooling system.

ISS017-E-011235 (15 July 2008) --- Russian Federal Space Agency cosmonaut Sergei Volkov, Expedition 17 commander, participates in a session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 54-minute spacewalk, Volkov and cosmonaut Oleg Kononenko (out of frame), flight engineer, continued to outfit the station's exterior, including the installation of a docking target on the Zvezda Service Module.

ISS017-E-011097 (15 July 2008) --- Russian Federal Space Agency cosmonaut Sergei Volkov, Expedition 17 commander, participates in a session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 54-minute spacewalk, Volkov and cosmonaut Oleg Kononenko (out of frame), flight engineer, continued to outfit the station's exterior, including the installation of a docking target on the Zvezda Service Module.

ISS017-E-011302 (15 July 2008) --- Russian Federal Space Agency cosmonaut Sergei Volkov, Expedition 17 commander, participates in a session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 54-minute spacewalk, Volkov and cosmonaut Oleg Kononenko (out of frame), flight engineer, continued to outfit the station's exterior, including the installation of a docking target on the Zvezda Service Module.

ISS038-E-036094 (27 Jan. 2014) --- Russian cosmonauts Oleg Kotov (right), Expedition 38 commander, and Sergey Ryazanskiy, flight engineer, attired in Russian Orlan spacesuits, participate in a session of extravehicular activity (EVA) in support of assembly and maintenance on the International Space Station. During the six-hour, eight-minute spacewalk, Kotov and Ryazanskiy completed the installation of a pair of high fidelity cameras that experienced connectivity issues during the Dec. 27 spacewalk, and retrieved scientific gear outside the station's Russian segment.

ISS037-E-028082 (9 Nov. 2013) --- Russian cosmonaut Sergey Ryazanskiy, Expedition 37 flight engineer, attired in a Russian Orlan spacesuit, participates in a session of extravehicular activity (EVA) in support of assembly and maintenance on the International Space Station. During the five-hour, 50-minute spacewalk, Ryazanskiy and Russian cosmonaut Oleg Kotov (out of frame) continued the setup of a combination EVA workstation and biaxial pointing platform that was installed during an Expedition 36 spacewalk on Aug. 22.

S122-E-008149 (13 Feb. 2008) --- Anchored to a foot restraint on the station's robotic Canadarm2, astronaut Rex Walheim, STS-122 mission specialist, transfers a large nitrogen tank assembly -- used for pressurizing the station's ammonia cooling system -- during the second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station.

ISS023-E-021506 (11 April 2010) --- NASA astronaut Rick Mastracchio, STS-131 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 26-minute spacewalk, Mastracchio and astronaut Clayton Anderson (out of frame), mission specialist, unhooked and removed the depleted ammonia tank and installed a 1,700-pound ammonia tank on the station’s Starboard 1 truss, completing the second of a three-spacewalk coolant tank replacement process.

ISS023-E-021515 (11 April 2010) --- NASA astronaut Rick Mastracchio, STS-131 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 26-minute spacewalk, Mastracchio and astronaut Clayton Anderson (out of frame), mission specialist, unhooked and removed the depleted ammonia tank and installed a 1,700-pound ammonia tank on the station’s Starboard 1 truss, completing the second of a three-spacewalk coolant tank replacement process.

ISS022-E-067157 (17 Feb. 2010) --- NASA astronaut Robert Behnken, STS-130 mission specialist, participates in the mission?s third and final session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 48-minute spacewalk, Behnken and Nicholas Patrick (out of frame), mission specialist, completed all of their planned tasks, removing insulation blankets and removing launch restraint bolts from each of the Cupola?s seven windows.

S134-E-008666 (22 May 2011) --- NASA astronaut Andrew Feustel, STS-134 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the eight-hour, seven-minute spacewalk, Feustel and astronaut Michael Fincke (out of frame), mission specialist, completed all planned tasks, including refilling one of the station’s cooling loops with ammonia and lubricating one of the station’s massive solar alpha rotary joints. Photo credit: NASA

ISS038-E-036126 (27 Jan. 2014) --- Russian cosmonauts Oleg Kotov (right), Expedition 38 commander, and Sergey Ryazanskiy, flight engineer, attired in Russian Orlan spacesuits, participate in a session of extravehicular activity (EVA) in support of assembly and maintenance on the International Space Station. During the six-hour, eight-minute spacewalk, Kotov and Ryazanskiy completed the installation of a pair of high fidelity cameras that experienced connectivity issues during the Dec. 27 spacewalk, and retrieved scientific gear outside the station's Russian segment.

ISS040-E-099392 (18 Aug. 2014) --- Russian cosmonaut Alexander Skvortsov, Expedition 40 flight engineer, attired in a Russian Orlan spacesuit, is pictured in this close-up view during a session of extravehicular activity (EVA) in support of science and maintenance on the International Space Station. During the five-hour, 11-minute spacewalk, Skvortsov and cosmonaut Oleg Artemyev (out of frame) deployed a small science satellite, retrieved and installed experiment packages and inspected components on the exterior of the orbital laboratory.

ISS038-E-022882 (27 Dec. 2013) --- Russian cosmonauts Oleg Kotov (right), Expedition 38 commander; and Sergey Ryazanskiy, flight engineer, attired in Russian Orlan spacesuits, participate in a session of extravehicular activity (EVA) in support of assembly and maintenance on the International Space Station. During the eight-hour, seven-minute spacewalk, Kotov and Ryazanskiy worked with two high-fidelity cameras, removed the Vsplesk experiment package and jettisoned it and replaced it with hardware for a more sophisticated earthquake-monitoring experiment, Seismoprognoz, which they attached to a Zvezda handrail.

ISS040-E-099390 (18 Aug. 2014) --- Russian cosmonaut Alexander Skvortsov, Expedition 40 flight engineer, attired in a Russian Orlan spacesuit, is pictured in this close-up view during a session of extravehicular activity (EVA) in support of science and maintenance on the International Space Station. During the five-hour, 11-minute spacewalk, Skvortsov and cosmonaut Oleg Artemyev (out of frame) deployed a small science satellite, retrieved and installed experiment packages and inspected components on the exterior of the orbital laboratory.

ISS022-E-066880 (17 Feb. 2010) --- NASA astronaut Nicholas Patrick, STS-130 mission specialist, participates in the mission’s third and final session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 48-minute spacewalk, Patrick and astronaut Robert Behnken (out of frame), mission specialist, completed all of their planned tasks, removing insulation blankets and removing launch restraint bolts from each of the Cupola’s seven windows.

ISS038-E-036326 (27 Jan. 2014) --- Russian cosmonauts Oleg Kotov, Expedition 38 commander, and Sergey Ryazanskiy (out of frame), flight engineer, attired in Russian Orlan spacesuits, participate in a session of extravehicular activity (EVA) in support of assembly and maintenance on the International Space Station. During the six-hour, eight-minute spacewalk, Kotov and Ryazanskiy completed the installation of a pair of high fidelity cameras that experienced connectivity issues during the Dec. 27 spacewalk, and retrieved scientific gear outside the station's Russian segment.

ISS022-E-066884 (17 Feb. 2010) --- NASA astronaut Nicholas Patrick, STS-130 mission specialist, participates in the mission’s third and final session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 48-minute spacewalk, Patrick and astronaut Robert Behnken (out of frame), mission specialist, completed all of their planned tasks, removing insulation blankets and removing launch restraint bolts from each of the Cupola’s seven windows.

ISS022-E-067184 (17 Feb. 2010) --- NASA astronauts Robert Behnken (left) and Nicholas Patrick, both STS-130 mission specialists, participate in the mission?s third and final session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 48-minute spacewalk, Behnken and Patrick completed all of their planned tasks, removing insulation blankets and removing launch restraint bolts from each of the Cupola?s seven windows.

S131-E-008708 (11 April 2010) --- NASA astronaut Rick Mastracchio (left) and Clayton Anderson, both STS-131 mission specialists, participate in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 26-minute spacewalk, Mastracchio and Anderson unhooked and removed the depleted ammonia tank and installed a 1,700-pound ammonia tank on the station?s Starboard 1 truss, completing the second of a three-spacewalk coolant tank replacement process.

ISS022-E-067168 (17 Feb. 2010) --- NASA astronauts Robert Behnken (top) and Nicholas Patrick, both STS-130 mission specialists, participate in the mission?s third and final session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 48-minute spacewalk, Behnken and Patrick completed all of their planned tasks, removing insulation blankets and removing launch restraint bolts from each of the Cupola?s seven windows.

ISS016-E-026454 (30 Jan. 2008) --- Astronaut Daniel Tani, Expedition 16 flight engineer, participates in a session of extravehicular activity (EVA) as maintenance and construction continue on the International Space Station. During the 7-hour, 10-minute spacewalk, Tani and astronaut Peggy Whitson (out of frame), commander, replaced a motor, known as the Bearing Motor Roll Ring Module (BMRRM), at the base of one of the station's solar wings. The BMRRM is part of the Beta Gimbal Assembly, which experienced electrical failures Dec. 8.

S134-E-008654 (22 May 2011) --- NASA astronaut Andrew Feustel, STS-134 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the eight-hour, seven-minute spacewalk, Feustel and astronaut Michael Fincke (out of frame), mission specialist, completed all planned tasks, including refilling one of the station’s cooling loops with ammonia and lubricating one of the station’s massive solar alpha rotary joints. Photo credit: NASA

S134-E-008650 (22 May 2011) --- NASA astronaut Andrew Feustel, STS-134 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the eight-hour, seven-minute spacewalk, Feustel and astronaut Michael Fincke (out of frame), mission specialist, completed all planned tasks, including refilling one of the station’s cooling loops with ammonia and lubricating one of the station’s massive solar alpha rotary joints. Photo credit: NASA

ISS016-E-011627 (20 Nov. 2007) --- Astronaut Peggy A. Whitson, Expedition 16 commander, participates in a session of extravehicular activity (EVA) as maintenance and construction continue on the International Space Station. During the 6-hour, 40-minute spacewalk Whitson and astronaut Daniel Tani (out of frame), flight engineer, began the external outfitting of the Harmony node in its new position in front of the Destiny laboratory.

ISS040-E-099383 (18 Aug. 2014) --- Russian cosmonaut Alexander Skvortsov, Expedition 40 flight engineer, attired in a Russian Orlan spacesuit, participates in a session of extravehicular activity (EVA) in support of science and maintenance on the International Space Station. During the five-hour, 11-minute spacewalk, Skvortsov and cosmonaut Oleg Artemyev (out of frame) deployed a small science satellite, retrieved and installed experiment packages and inspected components on the exterior of the orbital laboratory.

ISS038-E-021696 (27 Dec. 2013) --- Russian cosmonauts Oleg Kotov, Expedition 38 commander; and Sergey Ryazanskiy, flight engineer, attired in Russian Orlan spacesuits, participate in a session of extravehicular activity (EVA) in support of assembly and maintenance on the International Space Station. During the eight-hour, seven-minute spacewalk, Kotov and Ryazanskiy worked with two high-fidelity cameras, removed the Vsplesk experiment package and jettisoned it and replaced it with hardware for a more sophisticated earthquake-monitoring experiment, Seismoprognoz, which they attached to a Zvezda handrail.

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.

ISS022-E-067161 (17 Feb. 2010) --- NASA astronaut Robert Behnken, STS-130 mission specialist, participates in the mission?s third and final session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the five-hour, 48-minute spacewalk, Behnken and Nicholas Patrick (out of frame), mission specialist, completed all of their planned tasks, removing insulation blankets and removing launch restraint bolts from each of the Cupola?s seven windows.

ISS040-E-099375 (18 Aug. 2014) --- Russian cosmonauts Alexander Skvortsov and Oleg Artemyev (out of frame), both Expedition 40 flight engineers, attired in Russian Orlan spacesuits, participate in a session of extravehicular activity (EVA) in support of science and maintenance on the International Space Station. During the five-hour, 11-minute spacewalk, Artemyev and Skvortsov deployed a small science satellite, retrieved and installed experiment packages and inspected components on the exterior of the orbital laboratory.

ISS023-E-021562 (11 April 2010) --- NASA astronaut Clayton Anderson, STS-131 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 26-minute spacewalk, Anderson and Rick Mastracchio (out of frame), mission specialist, unhooked and removed the depleted ammonia tank and installed a 1,700-pound ammonia tank on the station’s Starboard 1 truss, completing the second of a three-spacewalk coolant tank replacement process.

ISS023-E-021503 (11 April 2010) --- NASA astronaut Rick Mastracchio, STS-131 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 26-minute spacewalk, Mastracchio and astronaut Clayton Anderson (out of frame), mission specialist, unhooked and removed the depleted ammonia tank and installed a 1,700-pound ammonia tank on the station’s Starboard 1 truss, completing the second of a three-spacewalk coolant tank replacement process.

ISS006-E-46357 (8 April 2003) --- Astronaut Kenneth D. Bowersox, Expedition Six mission commander, emerges from the Quest airlock on the International Space Station (ISS) to begin a session of extravehicular activity (EVA) to perform a variety of maintenance tasks. Astronaut Donald R. Pettit (out of frame), NASA ISS science officer, joined Bowersox on the spacewalk.