The concept of a lunar catapult harks back to Cold War-era research into space colonisation. On the atmosphere-free Moon, with reduced gravity and absence of weather systems, an electromagnetic launch mechanism could, theoretically, propel cargo – including raw materials, fuel or satellites – into space without requiring rockets.
Article source: https://www.express.co.uk/news/us/2170046/elon-musk-wants-build-giant-electromagnetic-catapult-moon-xai-satellites