Elon Musk said:“I want to live long enough to see a mass driver on the Moon, because that is going to be incredibly epic”This is not just about building infrastructure on the Moon. It is about building one of the most ambitious futures humanity has ever imaginedA lunar mass driver will unlock an entirely new space economy, move enormous amounts of cargo beyond the Moon and open the solar system to human expansionA future far more exciting than anything humanity has experienced before

Five Weird Things That Happen in Outer Space - NASA