Expedition 73 Flight Engineers Chris Williams and Zena Cardman
iss073e1198126 (Nov. 28, 2025) --- Expedition 73 Flight Engineers Chris Williams and Zena Cardman, both NASA astronauts, seen here with the ISS Ham Radio during a school contact inside the International Space Station's Columbus laboratory module. Cardman was helping new NASA Flight Engineer Chris Williams familiarize himself with station hardware, operations, and systems during his second day aboard the orbital outpost.