A SpaceX Falcon 9 second-stage rocket segment struck the Moon on Wednesday, creating a crater approximately 18 meters across [1].
The intentional impact allows scientists to study a fresh lunar-surface sample and gather data on the Moon's composition. By observing the debris and the resulting crater, researchers can analyze materials that are typically buried beneath the surface.
The rocket segment, which originally launched in January 2025 [7], weighed approximately four tonnes and measured about 14 meters in length and four meters in width [4, 5, 6]. It collided with the lunar surface near the Einstein and Bell craters [1].
Reports on the exact speed of the impact vary slightly. One report said the segment hit the surface at 8,700 km/h [2], while another listed the speed as 8,690 km/h [3]. The collision occurred in the early morning of Aug. 5 [2].
NASA officials confirmed the impact and the size of the resulting crater [1]. The mission serves as a method for researchers to obtain a "fresh" sample of the lunar crust without needing to land a crewed mission, or a complex drilling rig, at that specific site.
This event follows a trend of using decommissioned spacecraft or rocket stages to perform kinetic impact experiments. Such events help scientists understand the mechanical properties of the lunar regolith—the layer of loose, fragmented material covering solid rock—and how it reacts to high-velocity collisions.
“The rocket segment struck the Moon, creating a crater about 18 meters across.”
This impact demonstrates the utility of 'controlled' space debris for scientific research. By using a massive, known object like a Falcon 9 stage, NASA and other researchers can create a predictable impact event to study how lunar soil is displaced, which provides critical data for future landing sites and resource extraction on the Moon.
