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Quite a wide variety of science activities took place today aboard the International Space Station exploring time perception, exercise and eyesight. The Expedition 56 crew members also worked on station plumbing, stowed satellite deployer gear and checked out communications gear.

Two-time station resident Alexander Gerst started his morning helping doctors understand how living in space alters time perception and impacts crew performance. Later he strapped himself into an exercise bike and attached electrodes to his chest to monitor his pulmonary function during the workout session.

NASA astronauts Ricky Arnold, Drew Feustel and Serena Auñón-Chancellor teamed up for eye exams with an ultrasound device to study microgravity’s effects on eyesight. The scans were downlinked real-time to scientists on Earth observing the retina and optic nerve while monitoring the health of the astronaut’s eyes.

Auñón-Chancellor started her day changing out a filter and valve in the station’s bathroom located in the Tranquility module. She then checked out Wi-Fi gear connected to antennas installed during a March 29 spacewalk after assisting Feustel in the Japanese Kibo lab module. The duo stowed gear after Wednesday’s successful deployment of a satellite to demonstrate space junk clean up.

Arnold was set to install radio frequency tags today to improve tool tracking but that task was postponed till after the Cygnus cargo ship departs July 15. He then moved on to emergency communication tests with control centers around the world before light maintenance work on a 3D manufacturing device.

The International Space Station deployed a satellite this morning to demonstrate the potential of removing space junk. Back inside the orbital lab, the Expedition 56 crew explored space physics, studied human research and conducted an emergency drill.

A new satellite was deployed into space today from outside the Japanese Kibo laboratory module. Officially named the NanoRacks-Remove Debris satellite, it will explore using a 3D camera to map the location and speed of space debris. It will also deploy a net to capture a nanosatellite that will simulate space junk.

NASA astronaut Ricky Arnold worked inside the Microgravity Science Glovebox to troubleshoot gear today for a semiconductor crystal growth experiment. Alexander Gerst, of the European Space Agency, set up dosimeters and measured the station’s acoustic levels to understand the effects on crews.

Arnold later joined fellow Soyuz MS-08 crewmates Drew Feustel of NASA and Oleg Artemyev of Roscosmos for an emergency drill. The trio practiced evacuating the station in their Soyuz crew ship in the unlikely event of an emergency.

U.S. and Russian cargo ships are due to launch to the space station this summer. Another cargo craft is due to end its stay at the orbital lab next month. SpaceX is counting down to a June 29 launch of its Dragon cargo ship. Roscosmos will launch its Progress 70 cargo craft on July 9. Finally, the Cygnus space freighter attached to the Unity module is due to end its stay July 15.

The Expedition 56 crew‘s schedule is full of space science today as cleanup continues after last week’s spacewalk. The International Space Station’s three newest crew members also brushed up on their safety skills.

Biology and physics were just part of the microgravity research taking place aboard the orbital laboratory today. NASA astronaut Serena Auñón-Chancellor started her day collecting blood and urine samples for a trio of ongoing human research studies. She then joined European Space Agency astronaut Alexander Gerst for the Myotone study observing how long-term space missions impact the biochemical properties of muscles. Gerst also researched ways to simplify and speed up procedures for astronauts for the Everywear experiment.

Auñón-Chancellor, Gerst and cosmonaut Sergey Prokopyev also gathered midday to review the location of safety gear throughout the space station. The trio also practiced emergency communication in the station’s Russian segment.

NASA astronaut Ricky Arnold spent the day cleaning soot created in a burner during a run of the Advanced Combustion Microgravity Experiment. That study is exploring ways to improve fuel efficiency, reduce pollution and prevent fires in space. Cosmonauts Oleg Artemyev and Prokopyev explored how living in microgravity affects their daily exercise regimen.

Commander Drew Feustel worked in the Quest airlock today continuing cleanup activities after Thursday’s six-hour, 49-minute spacewalk. Feustel scrubbed the U.S. spacesuit water loops then tested water samples for conductivity before wrapping up his day.

Expedition 56 Commander Drew Feustel and Flight Engineer Ricky Arnold of NASA completed the sixth spacewalk at the International Space Station this year at 2:55 p.m. EDT, lasting 6 hours, 49 minutes. The two astronauts installed new high-definition cameras that will provide enhanced views during the final phase of approach and docking of the SpaceX Crew Dragon and Boeing Starliner commercial crew spacecraft that will soon begin launching from American soil.

They also swapped a camera assembly on the starboard truss of the station, closed an aperture door on an external environmental imaging experiment outside the Japanese Kibo module, and completed two additional tasks to relocate a grapple bar to aid future spacewalkers and secured some gear associated with a spare cooling unit housed on the station’s truss.

This was the 211th spacewalk in support of assembly and maintenance of the unique orbiting laboratory where humans have been living and working continuously for nearly 18 years. Spacewalkers have now spent a total of 54 days, 23 hours and 29 minutes working outside the station.

During the ninth spacewalk of Feustel’s career, he moved into third place for total cumulative time spent spacewalking with a total of 61 hours and 48 minutes. It was Arnold’s fifth spacewalk with a total time of 32 hours and 4 minutes.

For updates about the crew’s activities on the unique orbiting laboratory, visit: https://blogs.nasa.gov/spacestation/. Get breaking news, images and features from the station on Instagram at: @iss and on Twitter @Space_Station and @ISS_Research.

Expedition 56 Commander Drew Feustel and Flight Engineer Ricky Arnold of NASA switched their spacesuits to battery power at 8:06 a.m. EDT, signifying the official start of today’s planned six-and-a-half-hour spacewalk outside the International Space Station.

Watch the spacewalk live on NASA Television and the agency’s website.

Arnold, embarking on his fifth spacewalk, is extravehicular crew member 1 (EV1). His spacesuit has red stripes, and views from a camera on Arnold’s helmet are designated with the number 17.

Feustel is designated extravehicular crew member 2 (EV2) for this spacewalk, the ninth of his career. Feustel’s spacesuit has no stripes, and views from his helmet camera are labeled with the number 18.

For updates about the crew’s activities on the unique orbiting laboratory, visit: https://blogs.nasa.gov/spacestation/. Get breaking news, images and features from the station on Instagram at: @iss and on Twitter @Space_Station and @ISS_Research.