In the early hours of August 5 (UTC), an abandoned SpaceX rocket stage is expected to slam into the Moon at around 8,700 kilometres per hour.

Launched in January 2025, the rocket sent two commercial lunar landers toward Earth’s nearest neighbour.

With its work done, the rocket lacked the fuel to return to Earth or move into deep space. It remained in an unstable orbit until gravity finally set it on a collision course with the lunar surface.

The crash itself poses no danger. However, it signals a looming regulatory problem. As governments and companies race to build a permanent presence on the Moon, there is almost no practical framework for coordinating activities that permanently reshape the lunar environment.

A rare scientific opportunity

For astronomers, the accident is a scientific opportunity. As scientists know the rocket’s size, speed and roughly where it will hit, the impact presents a rare chance to to study exactly what happens when something impacts the Moon.

The crash will provide data to improve computer models of how craters form and how lunar dust behaves.

Researchers expect the collision to excavate a crater roughly 20–30 metres across and eject a cloud of lunar dust, known as regolith, several kilometres above the surface.

What happens on the Moon stays on the Moon

Along with the dust cloud, the impact will also raise a tricky question: who gets to decide when humanity permanently changes the Moon?

Unlike Earth, the Moon has almost no atmosphere and no weather. As a result, any marks we leave behind will remain for a very long........

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