Elon Musk is aiming for his Space Exploration Technologies Corp. to bring patrons to Mars. Richard Branson and Paul Allen have focused their space businesses on a more mundane goal: reducing the cost of shipping cargo into earth's orbit. Their ideas will be showcased in Colorado this week at the Space Symposium trade show. Musk's fortune has risen 8 percent in the past 12 months, according to the Bloomberg Billionaires Index. Branson and Allen have each increased more than 10 percent.
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