Expedition 75 crew members aboard the International Space Station spent Tuesday on 3D bioprinting, cancer research and exercise studies while preparing for two spacewalks, NASA reported on Oct. 20, 2026.

NASA flight engineers Luke Delaney and Jessica Watkins used the Columbus laboratory module's BioFabrication Facility to process vascular cell samples into blood vessels, then stored them in a science freezer. NASA said vascular cells bioprinted in weightlessness are far superior to those made on Earth. Delaney later processed tumor samples in the Kibo laboratory module's Life Science Glovebox for analysis back on Earth, a study NASA says could help identify cellular and genetic influences on cancer and support more targeted therapies.

Canadian Space Agency flight engineer Joshua Kutryk exercised on the Tranquility module's advanced resistive exercise device while a motion capture system recorded markers from his hips to his feet. NASA flight engineer Anil Menon configured tools and inspected tethers in the Quest airlock for spacewalks scheduled for Oct. 29 and Nov. 5. Menon and Kutryk plan to install roll-out solar arrays on the station's truss during both spacewalks. NASA's Gaurang Patel said at a Tuesday preview news conference that the arrays increase power generation capability up to 30 percent.