SpaceX’s Falcon 9 Rocket Is About to Crash Into the Moon—and It Could Be Visible From Earth

If you ain a beardown capable telescope, you mightiness beryllium capable to witnesser past connected Wednesday: A dormant rocket is going to clang into the Moon.

On August 5, astatine astir 6:34 americium UTC, a spent SpaceX Falcon 9 precocious signifier is expected to deed the Moon's sunlit occidental limb adjacent Einstein crater astatine much than 5,400 mph. If it unfolds arsenic predicted, the clang could propulsion up a plume of debris agleam capable to concisely spot from Earth with the close equipment.

That would beryllium a first. No interaction flash has ever been recorded connected the sunlit look of the Moon, and that's precisely wherever the Falcon 9 clang is forecast to happen, kicking up plumes of particulate that could basal retired against the blackness of space. The findings are based successful portion connected 2 caller preprint studies.

That includes 1 posted July 27 to arXiv and led by William Jo, a doctoral campaigner astatine the University of Texas astatine Austin's Cockrell School of Engineering, that forecasts conscionable however large the interaction could be. To foretell the plume, Jo ran the clang done a high-resolution physics simulation that allowed him to exemplary what would hap erstwhile 3,900 kilograms of hollow metallic deed the lunar surface. That’s antithetic from coagulated meteorites making impact.

"It's similar an bare eggshell, due to the fact that it had each the substance successful it, and determination is simply a rocket motor astatine 1 extremity that's denser," David Goldstein, an aerospace-engineering prof astatine UT Austin who supervised the work, says of the Falcon 9.

Rather than burrowing successful similar a cannonball, the ammunition volition illness from its edges inward, throwing up a broad, debased curtain of ungraded spreading arsenic acold arsenic 183 kilometers wide arsenic good arsenic a thin, faster spike astir consecutive up. All told, the clang is forecast to displace astir 12,700 kilograms of debris.

Jo describes the simulation arsenic a "best-case" model. The codification is two-dimensional and axisymmetric, truthful it tin lone simulate the signifier coming consecutive down, engine-first, fundamentally similar dropping a pin connected its head. But the existent object—the spent signifier of a Falcon 9 that carried 2 landers to the Moon successful January 2025—is acold much apt to get astatine an angle. A glancing onslaught would propulsion up a smaller, dimmer plume, perchance without the large spike.

"I would presumption our survey arsenic the astir optimistic successful presumption of generating sprays," Goldstein said.

It’s a elaborate conjecture astatine the signifier of the splash, but whether a plume volition really beryllium disposable from Earth is different matter.

Laurence Trafton, an astronomer astatine UT Austin, says it's possible, but hard to cognize until the infinitesimal of impact. Size isn't the problem: A plume reaching 50 kilometers past the limb would span astir 28 arcseconds, astronomer-speak for an space that’s astir one‑sixtieth the evident width of the Moon successful the sky. At that size, "it tin beryllium easy resolved by a tiny telescope," Trafton writes successful an email.

The caller insubstantial provides an estimation of wherever precisely to bid a telescope. But opposition successful the nighttime entity could beryllium a confounding factor. The plume volition beryllium thing similar 30 to 300 times fainter than the blazing Moon beside it, and scattered moonlight volition lone marque viewing harder. Catching it volition necessitate "a precise dependable mount," Trafton says.

Timing volition beryllium connected the observer's side. The plume should highest astir 90 seconds aft impact, "long capable for an perceiver to witness," Trafton says. Geography is not, astatine slightest depending connected wherever you live.

The flash has to beryllium caught astatine night. For anyone northbound of a enactment from Massachusetts to Texas, the Moon volition bent truthful debased that they’ll beryllium peering done much than 3 times the accustomed thickness of atmosphere. That means viewers successful those locations volition beryllium looking done a murky, turbulent portion of entity that could lavation retired immoderate signs of the plume generated from the crash.