A SpaceX Rocket Part Is Expected to Smack Into the Moon in August, Highlighting the Growing Problem of Space Junk

A discarded piece of a SpaceX rocket is on course to collide with the moon in early August, an event with no risk to people on Earth but one that underscores how much abandoned hardware is now drifting through space. The object is the spent upper stage of a Falcon 9 booster, not the asteroid 2024 YR4 that has drawn separate headlines this year. While the strike itself is minor in scale, it has renewed attention on the volume of leftover equipment orbiting the planet and, increasingly, wandering beyond it.

The forecast comes from Bill Gray, an independent astrodynamicist who builds orbit-tracking software through his project, Project Pluto, a tool used widely by professional and amateur astronomers to follow objects moving through space. Gray's models flagged the collision months ago, and by last autumn his calculations already pointed to an August 5 impact date. Refined tracking data has since narrowed the expected moment of impact to roughly 2:35 a.m. Eastern time on that day.

Gray has been candid about what the event will and will not teach scientists. He described the crash as potentially offering a modest research payoff, saying it "may be of some (probably minor) scientific interest," while cautioning that any insights gained would likely be limited. More pointedly, he framed the incident as a symptom of a larger habit: rocket operators routinely leaving spent stages to drift rather than accounting for where they eventually end up.

That framing matters because the region around Earth and the moon has become increasingly cluttered with retired rocket bodies, dead satellites, and fragments from past collisions or breakups. Unlike objects in low Earth orbit, which typically burn up reentering the atmosphere within years, hardware flung toward the moon or into high, elongated orbits can linger for decades before gravity finally pulls it down. Tracking groups like Gray's exist precisely because no single government or company is responsible for cataloguing all of it.

For skywatchers hoping to witness the impact directly, the timing works against them. From Earth's vantage point, the rocket segment is expected to strike a portion of the lunar surface that will be in sunlight at the moment of collision, effectively washing out any visible flash or plume that might otherwise be seen through telescopes. That leaves researchers largely dependent on orbiting lunar spacecraft, rather than ground-based observation, to capture any physical evidence of the crash.

Even so, scientists are treating the event as a rare, if unplanned, experiment. A known mass striking the moon at a known time and speed offers a chance to study how debris interacts with the lunar surface, including how much material gets thrown up and how the resulting crater compares to predictions. Spacecraft already orbiting the moon, including instruments capable of imaging surface changes, may be able to document the aftermath even without a visible impact flash from Earth.

The bigger story, however, is less about this single piece of debris than about the pattern it represents. As commercial launches multiply and more countries and companies send hardware into deep space, incidents like this are likely to become less unusual. Gray's comments suggest that better planning for what happens to rocket stages after their job is done, rather than simply letting them coast until gravity decides their fate, is the real issue the August impact should put back on the table.

Source: Smithsonian Magazine