The upper stage of a SpaceX Falcon 9 rocket unintentionally struck the lunar surface on Aug. 5, 2024 [1].
The event highlights the growing challenge of orbital debris and the risks associated with spent rocket stages remaining in trajectories that intersect with celestial bodies.
The rocket had previously delivered its payload, the Hakuto-R spacecraft, after launching in January 2024 [4]. Following the delivery, the upper stage remained on a trajectory that led to the collision. The stage hit the Moon at an estimated speed of 5,400 mph [2].
South Korea's Danuri satellite, also known as the Korea Pathfinder Lunar Orbiter, observed the impact site. The collision created a new crater, and a visible dust plume on the lunar surface [1, 3].
While the impact was unintentional, it provided a rare opportunity for observers to track the trajectory of a spent stage. The event was monitored by various space agencies as the rocket approached the predicted impact site [1].
SpaceX has not issued a formal statement regarding the specific orbital calculations that led to the collision. However, the trajectory was tracked by international monitors prior to the impact on early Wednesday morning [1].
“The rocket’s upper stage impacted the lunar surface, creating a new crater and a dust plume”
This incident underscores the lack of international regulation regarding the disposal of spent rocket stages. As commercial lunar missions increase, the likelihood of unintentional collisions rises, potentially contaminating pristine lunar sites or damaging future infrastructure. The use of the Danuri orbiter to verify the impact demonstrates the critical role of third-party lunar monitoring in managing space traffic.
