Musk replied to a user's question about building a city on Mars on Twitter at 21:07 Beijing time, saying that if civilization remains stable in the next 30 years, a self-sufficient city with 1 million population will be built on Mars. Elon Musk has released a new plan to send five starships to Mars within two years, send humans to Mars within four years, and establish the first Mars city TERMINUS that can live 1 million people on Mars in 2050.