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Elon Musk predicts self-sustaining city on Mars in 20 years
Elon Musk predicts a self-sustaining Mars colony within 20 years, requiring one million people and massive cargo shipments.
SpaceX to send humans to Mars in next 20-30 years: Elon Musk's bold promise
SpaceX CEO Elon Musk said that his company is not only aiming to send astronauts but also common people to Mars.