A spent Falcon 9 upper stage will slam into the lunar surface on 5 August 2026, ending an uncontrolled journey that began with a dual payload launch in January 2025. The roughly 3.9-tonne object, a remnant of the mission that carried Firefly Aerospace’s Blue Ghost-1 lander and ispace’s Hakuto-R Mission 2, lost control after delivering its payloads and has since been drifting on a collision course with the Moon.

Scientists view the impact not as a threat but as an unplanned natural laboratory. The hollow metal structure of the rocket stage differs markedly from the solid, natural asteroids that have pocked the lunar surface for aeons, offering a unique comparative variable. Researchers plan to use the event to study crater formation mechanics and the dispersal of material across the surface in real time, data that can sharpen geological models of the Moon.

The impact is expected to occur on the near side, in the vicinity of the Einstein Crater, making it accessible to Earth-based observatories. The high-velocity collision is predicted to generate an ejecta plume rising up to 100 kilometres, with debris spreading across a radius of hundreds of kilometres. While the flash and dust cloud are unlikely to be visible to the naked eye, high-resolution telescopes are being readied to capture the initial moments.

NASA’s Lunar Reconnaissance Orbiter will play a central role in the aftermath, taking before-and-after imagery to precisely measure the dimensions of the new crater and map the distribution of ejected material. The findings are expected to help verify computer simulations and inform planning for future lunar surface infrastructure, where understanding impact dynamics is essential for long-term risk mitigation.