Tasmanian Scientists Detect Falcon 9 Stage Before It Crashed Into the Moon, Creating a 20‑Metre Crater

In an unusual twist of celestial mechanics, a 13‑metre‑long upper stage of SpaceX's Falcon 9 launch vehicle collided with the Moon last month, leaving a fresh impact feature roughly 20 metres across. The strike, confirmed by lunar imagery, marks one of the few documented instances of human‑made hardware hitting the lunar surface.

What set this event apart was the role played by a team from the University of Tasmania’s School of Natural Sciences. Using ground‑based radar, the researchers identified the tumbling booster days before it entered the Moon’s orbit, becoming the first group worldwide to spot the object in its final trajectory.

The detection came as part of a broader effort to monitor space debris and defunct spacecraft. While most orbital debris is tracked while it remains in Earth orbit, objects that have been sent on translunar trajectories are harder to follow due to distance and limited radar coverage. The Tasmanian team’s success demonstrates that existing radar facilities, when combined with precise orbital modeling, can extend tracking capabilities beyond Earth’s immediate environment.

SpaceX’s Falcon 9 is designed for reusability, with many first stages returning to Earth for refurbishment. However, the upper stage that powered the payload on its way toward the Moon is typically discarded after completing its burn. In this case, the stage’s residual velocity carried it past Earth’s sphere of influence, and gravitational interactions eventually guided it toward the lunar surface.

Scientists are now analyzing the impact site using high‑resolution lunar reconnaissance data to assess the crater’s dimensions and the composition of the debris. The 20‑metre-wide pit offers a rare, observable record of how artificial material behaves upon striking the Moon’s regolith, a subject of interest for future planetary protection policies and potential resource utilization studies.

Looking ahead, the incident underscores the need for coordinated international tracking of deep‑space objects, especially as commercial launch activity accelerates. Agencies such as NASA and ESA have already outlined plans to improve cataloguing of spacecraft on lunar or interplanetary trajectories. The University of Tasmania’s contribution may prompt additional investment in ground‑based radar networks, ensuring that similar events can be anticipated—and perhaps even mitigated—well before they reach another celestial body.