iss055e005656 (March 26, 2018) --- Expedition 55 Flight Engineers (from left) Norishige Kanai, Ricky Arnold and Drew Feustel gather inside the Unity module and take part in a spacewalk procedure conference with specialists on the ground at the Mission Control Center in Houston, Texas.

iss055e001919 (Mar. 12, 2018) --- Dwarf wheat plants in the Advanced Plant Habitat Facility, a facility to conduct plant bioscience research on the International Space Stations (ISS).

iss055e035366 (April 16, 2018) --- NASA astronaut Ricky Arnold performs maintenance on the Advanced Colloids Experiment Module located inside the Light Microscopy Module which is a modified commercial, highly flexible, state-of-the-art light imaging microscope facility that provides researchers with powerful diagnostic hardware and software in microgravity.

iss055e098109 (3/15/2018) --- Photo taken in the Japanese Experiment Module (JEM) aboard the International Space Station (ISS), showing the Multi-purpose Small Payload Rack (MSPR) Two-Phase Flow (TPF) Experiment Equipment. The Interfacial behaviors and Heat transfer characteristics in Boiling Two-Phase Flow (Two-Phase Flow) investigation helps to provide better fundamental understanding on the behavior of liquid-vapor flow, and the mechanism of heat transfer under microgravity.

iss055e098144 (3/15/2018) --- Japan Aerospace Exploration Agency (JAXA) astronaut Norishige Kanai is shown in the Japanese Experiment Module (JEM) aboard the International Space Station (ISS), working with the Multi-purpose Small Payload Rack (MSPR) Two-Phase Flow (TPF) Experiment. The Interfacial behaviors and Heat transfer characteristics in Boiling Two-Phase Flow (Two-Phase Flow) investigation helps to provide better fundamental understanding on the behavior of liquid-vapor flow, and the mechanism of heat transfer under microgravity.

iss054e001472 (Dec. 19, 2017) --- NASA astronaut Joe Acaba with Biological Research in Canisters - Light Emitting Diode (BRIC-LED) canisters in the Destiny Laboratory prior to installation to provide capabilities for seedling, microbial, or fungal growth investigations. NASA astronaut Mark Vande Hei is visible in the background.

iss055e004890 (3/24/2018) --- Photographic documentation taken during JAXA Protein Crystal Growth (PCG) Installation into the Protein Crystallization Research Facility (PCRF) of the Ryutai Rack.

iss054e019981 (1/9/2018) --- Photo documentation of Bio Dosimeters removed form the Japanese Experiment Module (JEM) Tissue Equivalent Proportional Counters (J-TEPC) packed in a ziplock bag for return to Earth. Photo was taken in the Kibo Japanese Experiment Pressurized Module (JPM) aboard the International Space Station (ISS) during Position Sensitive Tissue Equivalent Proportional Chamber (PS-TEPC) experiment operations (OPS).

iss054e047933 (Feb. 16, 2018) --- NASA astronaut and Expedition 53 Flight Engineer Mark Vande Hei is pictured servicing components on the Canadarm2 robotic arm during a spacewalk with astronaut Norishige Kanai (out of frame) of the Japan Aerospace Exploration Agency (JAXA).

iss054e047999 (Feb. 15, 2018) --- The Russian Progress 69 (69P) resupply ship approaches the aft end of the Zvezda service module where it docked Feb. 15, 2018, delivering over three tons of food, fuel and supplies for the Expedition 54 crew. The 69P stayed at the International Space Station for six months before undocking from Zvezda Aug. 22 loaded with trash and discarded gear for a fiery, but safe disposal over the Pacific Ocean on Aug. 29.

iss055e035350 (April 16, 2018) --- Cosmonaut Oleg Artemyev works on space station hardware at the end of his workday.

iss055e005543 (March 26, 2018) --- Expedition 55 Flight Engineer and astronaut Scott Tingle is pictured conducting the Transparent Alloys experiment inside the Destiny lab module's Microgravity Science Glovebox. The Transparent Alloys study is a set of five experiments that seeks to improve the understanding of melting-solidification processes in plastics without the interference of Earth's gravity environment. Results may impact the development of new light-weight, high-performance structural materials for space applications. Observations may also impact fuel efficiency, consumption and recycling of materials on Earth potentially reducing costs and increasing industrial competitiveness.

iss055e108820 (May 7, 2018) --- NASA astronaut Ricky Arnold is suited up inside his U.S. spacesuit for a fit check verification ahead of a spacewalk that took place May 16, 2016.

iss054e047994 (Feb. 15, 2018) --- The Russian Progress 69 (69P) resupply ship approaches the aft end of the Zvezda service module where it docked Feb. 15, 2018, delivering over three tons of food, fuel and supplies for the Expedition 54 crew. The 69P stayed at the International Space Station for six months before undocking from Zvezda Aug. 22 loaded with trash and discarded gear for a fiery, but safe disposal over the Pacific Ocean on Aug. 29.

iss054e005575 (12-26-2017) --- Japan Aerospace Exploration Agency (JAXA) astronaut Norishige Kanai poses for a photo with the installed Made in Space Fiber Optics Locker and the re-installed Additive Manufacturing Facility (AMF) Manufacturing Device (ManD). Photo was taken in the Destiny U.S. Laboratory abord the International Space Station (ISS). The Optical Fiber Production in Microgravity (Made In Space Fiber Optics) investigation demonstrates the merits of manufacturing fiber optic filaments in microgravity.

iss055e035338 (April 13, 2018) --- NASA astronaut Scott Tingle performs research operations with the Microgravity Sciences Glovebox inside the U.S. Destiny laboratory module. Tingle was working on the Metabolic Tracking experiment that looks at a particular type of medicine and how it interacts with human tissue cultures. Results could improve therapies in space and lead to better, cheaper drugs on Earth.

iss055e035373 (April 17, 2018) --- NASA astronauts Ricky Arnold (left) and Drew Feustel are pictured inside the Japanese Kibo laboratory module talking to high school and college students from Lake Orion, Mich.

iss054e026583 (Jan. 31, 2018) --- NASA astronaut Joe Acaba during a Synchronized Position Hold, Engage, Reorient, Experimental Satellites (SPHERES) Smoothing-Based Relative Navigation (SmoothNav) experiment test run. SPHERES is a self-contained, free-flying satellite to test autonomous capabilities and docking maneuvers within the International Space Station (ISS). SmoothNav software uses a unique computational method to estimate position and velocity in multi-satellite formations.

iss055e005587 (March 26, 2018) --- Expedition 55 Commander Anton Shkaplerov (foreground) and Flight Engineer Oleg Artemyev, both cosmonauts representing Roscosmos, replace manifold bottles inside the the Destiny lab module's Combustion Integrated Rack.

iss055e008292 (April 2, 2018) --- Astronauts Ricky Arnold and Scott Tingle scrub water cooling loops inside a pair of U.S. spacesuits after the completion of spacewalk on March 29, 2018.

iss054e026863 (Feb. 2, 2018) --- The Plant Gravity Perception experiment in a centrifuge before its second run on the European Modular Cultivation System (EMCS) Experiment Container (EC) to test the gravity-sensing ability of plants in microgravity.

iss054e023800 (Jan. 26, 2018) --- NASA astronaut Joe Acaba placing an Experiment Container (EC) on the European Modular Cultivation System (EMCS) for the the first run of the Plant Gravity Perception experiment to test the gravity-sensing ability of plants in microgravity.

iss054e005568 (12-26-2017) --- View of the Made In Space Fiber Optics Locker installed in ExPRESS (Expedite the Processing of Experiments to Space Station) Rack 7. The Optical Fiber Production in Microgravity (Made In Space Fiber Optics) investigation demonstrates the merits of manufacturing fiber optic filaments in microgravity.

iss054e023776 (Jan. 26, 2018) --- NASA astronaut Joe Acaba removing an Experiment Container (EC) on the European Modular Cultivation System (EMCS) for the the first run of the Plant Gravity Perception experiment to test the gravity-sensing ability of plants in microgravity.

iss054e020553 (Dec. 30, 2017) --- A warning sign (DO NOT BUMP) is attached to the Cell Biology Experiment Facility (CBEF) in the Kibo Japanese Experiment Pressurized Module (JPM). CBEF is a subrack facility that functions as an incubator with an artificial gravity generator, and it is used in various life science experiments.

iss055e008293 (April 2, 2018) --- Astronaut Ricky Arnold completes the scrubbing of water cooling loops inside a pair of U.S. spacesuits after the completion of spacewalk on March 29, 2018.

iss054e020555 (Dec. 30, 2017) --- View of the Cell Biology Experiment Facility (CBEF) in the Kibo Japanese Experiment Pressurized Module (JPM) taken during operations to examine the formation of molecules related to Alzheimer's disease. A warning sign (DO NOT BUMP) is attached to the CBEF.

iss054e052250 (Feb. 20, 2018) --- NASA astronaut Joe Acaba removes Seed Cassettes for the Plant Gravity Perception experiment, which tests the gravity sensing ability of plants in microgravity.

iss054e020928 (1/12/2018) --- Photo documentation of the Bioculture System Facility installed in the SpaceX Dragon Commercial Resupply Services-13 (CRS-13) spacecraft for return to Earth. The Bioculture System Hardware Validation (Cell Science-Validation) tests the performance and life-support capability of a new cell culture hardware system for use aboard the International Space Station (ISS).

iss054e026580 (Jan. 31, 2018) --- Vertigo hardware used on Synchronized Position Hold, Engage, Reorient, Experimental Satellites (SPHERES) during a test run of Smoothing-Based Relative Navigation (SmoothNav). SPHERES is a self-contained, free-flying satellite to test autonomous capabilities and docking maneuvers within the International Space Station (ISS). SmoothNav software uses a unique computational method to estimate position and velocity in multi-satellite formations.

iss055e109714 (May 24, 2018) --- The Northrop Grumman (formerly Orbital ATK) Cygnus resupply ship with its round, brass-colored UltraFlex solar arrays is guided to its port on the Unity module shortly after it was captured with the Canadarm2 robotic arm.

iss054e001485 (Dec. 19, 2017) --- NASA astronaut Joe Acaba with Biological Research in Canisters - Light Emitting Diode (BRIC-LED) canisters prior to installation in the Destiny Laboratory to provide capabilities for seedling, microbial, or fungal growth investigations.

iss054e023797 (Jan. 26, 2018) --- NASA astronaut Joe Acaba with an Experiment Container (EC) to begin the Plant Gravity Perception experiment, testing the gravity-sensing ability of plants in microgravity.

iss054e026578 (Jan. 31, 2018) --- Vertigo hardware used on Synchronized Position Hold, Engage, Reorient, Experimental Satellites (SPHERES) during a test run of Smoothing-Based Relative Navigation (SmoothNav). SPHERES is a self-contained, free-flying satellite to test autonomous capabilities and docking maneuvers within the International Space Station (ISS). SmoothNav software uses a unique computational method to estimate position and velocity in multi-satellite formations.

iss055e001931 (Mar. 12, 2018) --- Dwarf wheat plants during routine cleaning in the Advanced Plant Habitat Facility, a facility to conduct plant bioscience research on the International Space Stations (ISS).

iss055e008298 (April 2, 2018) --- Astronauts Scott Tingle (left) and Ricky Arnold wrap up spacesuit work following a successful spacewalk on March 29, 2018. The duo scrubbed cooling loops, performed the iodination of ion filters and tested the water conductivity inside a pair of U.S. spacesuits.

iss055e108824 (May 7, 2018) --- NASA astronaut Drew Feustel is suited up inside his U.S. spacesuit for a fit check verification ahead of a spacewalk that took place May 16, 2016.