More Summer 2025 Expedition 73 Crew Photos | International Space Station

More Summer 2025 Expedition 73 Crew Photos | International Space Station

Expedition 73 Flight Engineers Zena Cardman and Jonny Kim, both NASA astronauts, smile for a portrait during a break in their research duties aboard the International Space Station.

Japan Aerospace Exploration Agency (JAXA) astronaut and Expedition 73 Flight Engineer Kimiya Yui treats bioprinted liver tissues in a portable glovebag inside the International Space Station's Harmony module. The samples will be placed inside an artificial gravity-generating research device to help researchers understand how microgravity affects the formation of blood vessels in engineered tissues. Result may lead to advanced treatments protecting astronauts on long-duration spaceflights and improve bioprinting techniques for patient therapies on Earth.

NASA astronaut and Expedition 73 Flight Engineer Mike Fincke shows off production packs containing research samples for the BioNutrients-3 investigation. The biotechnology study explores ways to produce vitamins and nutrients on spacecraft helping supply adequate nutrition for long-term space missions. Fincke treated yeast, yogurt, and fermented milk samples then stowed them in a research incubator for later analysis.

Roscosmos cosmonaut and Expedition 73 Commander Sergey Ryzhikov of Russia holds a headset inside the International Space Station's Quest airlock. Ryzhikov was conducting a hearing examination frequently conducted inside Quest due to the module's quiet environment. Quest is used primarily to service spacesuits and stage spacewalks.

Japan Aerospace Exploration Agency (JAXA) astronaut Kimiya Yui trims NASA astronaut Mike Fincke's hair aboard the International Space Station. Attached to the electric razor is a vacuum that collects the loose hair safeguarding the station's atmosphere in the microgravity environment.

Japan Aerospace Exploration Agency (JAXA) astronaut Kimiya Yui smiles for a portrait after trimming NASA astronaut Mike Fincke's hair aboard the International Space Station.

Astronaut Kimiya Yui of Japan Aerospace Exploration Agency (JAXA) smiles for a portrait after trimming his own hair aboard the International Space Station. Attached to the electric razor is a vacuum that collects the loose hair safeguarding the station's atmosphere in the microgravity environment.

NASA astronaut and Expedition 73 Flight Engineer Zena Cardman treats bioprinted liver tissues in a portable glovebag inside the International Space Station's Harmony module. The samples will be placed inside an artificial gravity-generating research device to help researchers understand how microgravity affects the formation of blood vessels in engineered tissues. Result may lead to advanced treatments protecting astronauts on long-duration spaceflights and improve bioprinting techniques for patient therapies on Earth.

Update: The Expedition 73 crew aboard the International Space Station continues to unpack more than 11,000 pounds of critical spares, food and supplies delivered Sept. 18, 2025, by a Cygnus XL commercial resupply mission. The arrival of the Cygnus XL to the space station was delayed by one day, due to changes in the rendezvous planning resulting from the main spacecraft engine shutting down early on two burns on Sept. 16.

Follow Expedition 73:
https://blogs.nasa.gov/spacestation/

Expedition 73 Crew

Station Commander: Sergey Ryzhikov (Roscosmos)

JAXA Flight Engineer (Japan): Kimiya Yui

Roscosmos (Russia) Flight Engineers: Alexey Zubritskiy, Oleg Platonov

NASA Flight Engineers: Jonny Kim, Zena Cardman, Mike Fincke

An international partnership of space agencies provides and operates the elements of the International Space Station (ISS). The principals are the space agencies of the United States, Russia, Europe, Japan, and Canada.

Learn more about the important research being operated on Station:
https://www.nasa.gov/iss-science

For more information about STEM on Station:

https://www.nasa.gov/stemonstation
Science, Technology, Engineering, Math (STEM)

Image Credit: NASA's Johnson Space Center
Capture Dates: Aug. 31-Sept. 10, 2025

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