Odaily News Elon Musk responded to a user's question about building a city on Mars on Twitter at 21:07 Beijing time. He said that if civilization remains stable in the next 30 years, a self-sufficient city with a population of 1 million will be built on Mars. It was previously reported that Elon Musk released a new plan to launch 5 starships to Mars within 2 years, send people to Mars within 4 years, and build the first Martian city TERMINUS on Mars that can accommodate 1 million people in 2050.