Life on Mars was once referred to something we were trying to discover. Now it's something we're trying to create. And the possibility of putting humans on Mars is a goal that could be reached in the not-too-distant future. Mars One, a private space venture from the Netherlands, plans to start colonies on Mars by 2023. And Elon Musk, founder of SpaceX, recently revealed his vision of building a colony on Mars the size of a small city.
But how much would it cost to send humans to the Red Planet?
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