姐さんはNASAの宇宙飛行士としてはもう飛べないからね。宇宙放射線のリミットあたって引退したんだから。NASAがこれを許すのか、医学的リサーチつけるのかどうかが気になるところだね。
"I have hit my radiation limit," Whitson told Business Insider during a recent interview. "So not going into space with NASA anymore."
https://www.businessinsider.com/nasa-astronaut-peggy-whitson-career-2018-6
NASA medical qualification testing to be approved for flight. López-Alegría will serve as the mission commander, with Peggy Whitson and John Shoffner as backups.
https://www.nasa.gov/press-release/nasa-axiom-agree-to-first-private-astronaut-mission-on-space-station