The school-bus-size object is the second stage of a SpaceX Falcon 9 rocket that had launched a lunar lander from Firefly Aerospace toward the moon in January 2025. A Chinese rocket stage crashed into the moon in March 2022 after completing a lunar test mission. Its small power source of plutonium-238 likely remains harmlessly on the lunar surface. NASA intentionally crashed stages from its Saturn V moon rocket into the moon in the 1970s to study the impacts' seismic effects. It would not want errant pieces of space ‌junk impacting those assets.