关于SpaceX在月球和火星上建城市，马斯克给出时间表

Core Viewpoint - SpaceX aims to establish self-sustaining cities on the Moon and Mars, with a focus on achieving the Moon city within a decade and the Mars city in over 20 years [1][3]. Group 1 - SpaceX has shifted its focus to building a self-sustaining city on the Moon, with the potential to achieve this goal in less than 10 years [3]. - The company plans to initiate work on the Mars city in approximately 5 to 7 years, despite the longer timeline for completion [3]. - Elon Musk's recent acquisition of the AI startup xAI is seen as a strategic move to integrate advanced technologies for the development of interstellar AI [3].