NASA astronauts Kayla Barron and Raja Chari conduct a spacewalk at the International Space Station (ISS) ISS Expedition 66 U.S. Spacewalk #79 for the IROSA 3A power channel preparations to assemble and install brackets and struts kits for upcoming solar array upgrades. The new ISS Roll-Out Solar Arrays, or iROSAs, will increase the space station’s total available power. So far, two of six iROSAs have been deployed on the station with four additional arrays to be delivered. Barron will serve as extravehicular crewmember 1 (EV 1) and will wear a suit with red stripes. Chari will serve as extravehicular crewmember 2 (EV 2) and will wear a suit with no stripes. The spacewalk will be the second of Barron’s career and the first for Chari.