French astronaut Sophie Adenot, who launched to the International Space Station (ISS) on February 13, has also obtained her amateur radio operator certificate, identified by the call sign KJ5LTN, which she received on June 24, 2025. This certification allows her to communicate with other radio amateurs via relay antennas, a practice that, despite its seemingly dated nature compared to modern communication technologies, has been a vital part of space exploration since the launch of the first amateur radio satellite, Oscar-1, in 1961. This initiative highlights a long-standing collaboration between space agencies and radio amateurs, fostering a culture that continues to be relevant in space communication.