Stepping Into the Vacuum
NASA astronaut Jessica Meir and European Space Agency (ESA) astronaut Sophie Adenot exited the International Space Station on September 1 for U.S. Spacewalk 99, a planned ~6.5-hour excursion to replace a retroreflector on the station's Harmony module and complete several maintenance tasks.
The retroreflector is a passive navigation device that reflects laser signals from approaching spacecraft, enabling precise docking guidance. Its replacement is essential for maintaining the station's ability to receive crew and cargo vehicles.
A Third Walk for Adenot
The spacewalk marks Sophie Adenot's third career EVA (extravehicular activity), making her one of the most experienced European spacewalkers. Adenot, a former test pilot with the French Air Force, has been steadily accumulating spacewalking experience since arriving at the station earlier this year.
Meir, a veteran of multiple ISS expeditions, serves as crew member 1 (wearing the suit with red stripes), while Adenot serves as crew member 2.
The Maintenance Backlog
The spacewalk is part of a series of EVAs aimed at maintaining and upgrading the station's external systems. Previous spacewalks in August addressed antenna replacements and solar array mounting hardware installation, reflecting the ongoing work needed to keep the 26-year-old orbital laboratory operational.
Live coverage of the spacewalk was available on NASA+ and the agency's streaming platforms.
