SpaceX Falcon 9’s upper stage, adrift for 18+ months, is believed to have struck the Moon at ~2.43 km/s after its orbit shifted naturally. NASA says there’s no risk to Earth, while scientists hope to study the impact as concerns over growing space debris continue.
Scientists warn about space debris after huge SpaceX rocket part thought to have hit Moon
The stray upper stage (section) of SpaceX's Falcon 9 rocket is about the size of a five-storey building, with a mass of at least 4,000kg.
bbc.com