Russian cosmonauts install sun-watching telescope on ISS during 6-hour spacewalk

Two Russian cosmonauts worked to install and retrieve science experiments while on a spacewalk outside the International Space Station on Wednesday (May 27). Expedition 74 commander Sergey Kud-Sverchkov and flight engineer Sergei Mikaev spent 6 hours and 5 minutes outside the space station, conducting an extravehicular activity (EVA) that ran from 10:18 a.m. to 4:23 p.m. EDT (1418 to 2023 GMT). The two spacewalkers installed a solar radiation experiment on the exterior of the Zvezda service module and removed science hardware from the Poisk and Nauka modules on the station's Russian segment. The Solntse-Teragerts telescope that the duo mounted outside Zvezda was designed to observe and collect data about strong solar flares emanating from the sun . The instrument will help scientists improve their prediction models and better understand solar flare activity at different frequencies. The device is expected to operate through 2028. Russian cosmonaut Sergey Kud-Sverchkov (at left) holds up a card with a logo celebrating the 80th anniversary of the design bureau RSC Energia as he and Sergei Mikaev pose for a photograph during a spacewalk outside of the International Space Station on Wednesday, May 27, 2026. …