Overview
- The Korea Aerospace Administration confirmed that a spent Falcon 9 upper stage struck the Moon near Einstein Crater on Aug. 5, producing a visible mark and redistributed surface material in images from South Korea’s Danuri orbiter.
- Observers estimate the stage weighed roughly four tonnes and hit at about 8,700 km/h, a strike expected to carve a crater on the order of tens of metres and to have released energy comparable to a few tons of TNT.
- The European Southern Observatory’s Very Large Telescope recorded sodium and likely lithium lines in the ejecta plume, and other telescopes reported a brief flash followed by a sunlight‑lit dust cloud visible for minutes.
- Scientists say the known mass, speed and trajectory make this a rare chance to test impact and ejecta models, and NASA’s Lunar Reconnaissance Orbiter and other missions have planned follow‑up imaging and measurements.
- Agencies and experts pointed to 18 months of orbital perturbations from solar radiation pressure and gravity as the cause and called for better cislunar situational awareness, coordinated disposal standards, and traffic‑management measures as lunar activity increases.