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A major part of Musk’s philosophy relates to space exploration and the quest to make humanity a multiplanetary species. He believes that in 20 to 30 years, SpaceX could establish a self-sustaining city on Mars—a "second Earth" where civilization can thrive independently of Earthly resupply missions.
He envisions a city with roughly a million residents capable of growing and expanding autonomously, even in a hostile environment. Musk emphasizes that creating such a civilization is essential to preserve humanity in case of planetary catastrophe or other existential threats.