Astronauts Suni Williams and Butch Wilmore are expected to leave the International Space Station (ISS) by December 31, 2024. If they depart on a spacecraft that has undocked from the ISS and begun its return journey to Earth, the event is considered resolved. The outcome will be determined by official NASA announcements, with credible reporting providing an additional source of confirmation. The market will resolve to "Yes" if the astronauts depart before the specified deadline, and to "No" otherwise. If a credible report contradicts an official announcement, the market's resolution may still depend on the original statement from NASA.