Analysis indicates spent SpaceX Falcon 9 upper stage likely struck the Moon

A spent SpaceX Falcon 9 upper stage likely hit the Moon on August 5 after more than a year in space, according to scientists and news reports tracking the object’s final path. The hardware was the rocket’s upper stage from a January 15, 2025 Falcon 9 launch that carried Firefly Aerospace’s Blue Ghost Mission 1 and ispace’s RESILIENCE lunar lander, according to SpaceX, NASA, Firefly and ispace. The impact was not expected to be visible live from Earth, but astronomers had predicted a collision near the Einstein crater region at about 5:35 a.m. BST, or 2:35 a.m. EDT, on August 5. New Scientist reported the stage was about 14 meters long and 4,000 kilograms, while BBC, cited via Yahoo, said the upper section had a mass of at least 4,000 kilograms and was about the size of a five-storey building. (spacex.com) ### Which rocket stage was involved? SpaceX said the Falcon 9 launched on January 15, 2025 from Kennedy Space Center carrying Firefly’s Blue Ghost Mission 1 and ispace’s RESILIENCE lunar lander. NASA said the same launch carried 10 NASA science and technology instruments aboard Blue Ghost under its Commercial Lunar Payload Services program. Firefly said Blue Ghost landed on the Moon on March 2, 2025 and completed more than 14 days of surface operations. ispace said RESILIENCE separated successfully after launch as part of its Mission 2 program. (newscientist.com) ### Why did the stage end up on a collision course with the Moon? New Scientist reported that the heavy payload required more thrust than usual when Falcon 9 launched, leaving the upper stage without the margin needed for a disposal maneuver. (spacex.com) The magazine said the stage then drifted in space until its orbit unintentionally intersected the Moon. (fireflyspace.com) BBC, cited via Yahoo, reported NASA spokesperson Jimi Russell said the collision posed “no danger to Earth” and that the agency would “collect lunar data from the event and refine techniques for tracking objects in space.” Reuters, cited in other pickups, also reported confirmation was expected to depend on specialist telescopes and later observations rather than direct live imagery. (newscientist.com) ### How fast was the impact, and why do reports use two numbers? New Scientist reported the stage hit the Moon at 8,700 kilometers per hour. Forbes and NBC News gave the equivalent figure as about 5,400 miles per hour. Those figures describe the same speed in different units. NPR reported NASA estimated the strike would create a crater about 60 feet across and 12 feet deep. (yahoo.com) New Scientist cited a NASA prediction of an 18-meter-wide crater about 4 meters deep, which is the same estimate in metric units. ### Did anyone actually see the crash happen? NBC News reported a telescope in Chile detected what astronomers identified as a debris plume from the crash, even though no one directly observed the moment of impact. (newscientist.com) Wired reported scientists had detected signals consistent with the strike and said lunar orbiters could return the first images of the site in the coming days. (npr.org) New Scientist reported telescopes around the world had been trained on the predicted impact zone and that lunar orbiters from South Korea and the United States were expected to observe the site. Hannah Sargeant of the University of Leicester told the magazine that before-and-after images should emerge soon. (nbcnews.com) ### Why are scientists talking about debris and lunar traffic? Hannah Sargeant told New Scientist that “it is not a good thing to be randomly sending debris into the moon” and asked what would happen if such an impact damaged a site of special interest, including Apollo hardware. Roberto Bugiolacchi of the Macau University of Science and Technology told the magazine planetary surfaces should be kept as pristine as feasible, while noting the Moon already bears debris and scars from decades of missions and natural impacts. (newscientist.com) BBC, cited via Yahoo, reported astronomer Matt Bothwell warned that crowding by human-made objects could complicate future missions. NASA said it will use the event to gather lunar data and improve tracking methods, while orbiters and telescopes are expected to provide the next confirmation of the impact site. (yahoo.com) (newscientist.com)