Discarded Falcon 9 upper stage is expected to strike the Moon on August 5
A discarded SpaceX Falcon 9 upper stage is expected to strike the Moon on Aug. 5, 2026, according to a research paper published in July outlining plans to observe the predicted impact.
The event is not described as an intentional lunar mission. Instead, researchers identify the object as a discarded Falcon 9 upper stage and frame the anticipated collision as an opportunity for astronomical observation, tracking and scientific study.
The available research source does not give a precise impact time or a location on the Moon. It also cautions, by implication of the ongoing tracking effort, that predicted timing may be refined as new tracking data become available.
Observations planned around a predicted impact
The paper, titled Observational planning for the 2026 August 5 Falcon 9 Upper Stage lunar impact, describes preparations for observing the expected Aug. 5 collision. Its focus is on how observers and tracking networks can use the event for measurement and study.
The expected impact has also been listed as a scheduled international science event for August 2026. A separate Graphic News agenda entry describes the object as roughly the height of a five-story building and links the event to broader concerns about debris in lunar space.
That size description is an approximate comparison, not a measurement supplied in the research paper. The approved sources provide no further dimensions, mass, trajectory details or estimate of the impact’s energy.
Researchers’ planning does not mean the timing or exact impact point is final. The available material says the collision is expected on Aug. 5, rather than confirming that it has occurred. It does not specify whether the impact can be seen from any particular place on Earth.
What is known — and what is not
Falcon 9 is a SpaceX launch vehicle, and the object in this case is identified as one of its upper stages. Upper stages are the portions of launch vehicles that continue after separation from earlier stages. The sources supplied for this report do not identify the particular launch associated with this object.
They also do not establish whether SpaceX has issued a separate public statement about the expected impact. No account from the company is included in the source packet.
There is no supported basis in the available material to describe the predicted collision as deliberate, to say it will cause environmental damage, or to state that it will be visible from Earth. Those questions would require more specific trajectory, visibility or post-impact information than the sources provide.
Why the event is being watched
The planned observations place the expected collision in a broader discussion about monitoring lunar impacts and managing discarded objects in cislunar space, the region of space around Earth and the Moon. The research paper specifically presents the event as useful for astronomical observation and tracking.
For observers, the immediate task is to prepare for the predicted Aug. 5 event and to update plans if tracking data change the forecast. The next known milestone is the expected lunar impact itself. Any confirmed impact time, location, observational results or assessment of effects would depend on information released after the event.
Until then, the clearest established facts are limited: a discarded Falcon 9 upper stage is predicted to impact the Moon on Aug. 5, and researchers have published an observational plan intended to help document and study that anticipated event.
Sources
- Observational planning for the 2026 August 5 Falcon 9 Upper Stage lunar impact, arXiv research repository
- World Agenda: August 2026, Graphic News